Ma'ad is derived from the root word Aud that means to return. Hence the returning of the spirit (rooh) back to it's body is called Ma'ad. Ma'ad is one of the fundamental principals of Islamic faith and belief in it is incumbent upon all Muslims. After death every soul shall arise to see the reward or retribution (as the case may be) of their deeds.
Ma'ad consists of stages Death (Maut), Grave (Qabr), Intermediate Stage (Barzakh), Resurrection (Qayamat) and Paradise (Jannat) or hell (jahannam). Ma'ad cannot be perceived by the five senses of man, but can be comprehended by reasoning alone. What happens after death? The Holy Prophet (S.A.W.S.) through the medium of Revelation (Wahy) has explained to us in detail regarding it. Man's senses has it's own limitations beyond which it is not possible for him to understand. For example, a child in the mother's womb cannot perceive the vastness of the outside world.
In the same manner, a soul captivated by the influences of matter can not easily understand the hidden world and it's realities. The knowledge of this unseen world is concealed from man and he can only understand it through the medium of the Holy Prophet (S.A.W.S.) and his Vicegerents, the Holy Aimmah (A.S.). Hence to have a better comprehension of the hereafter, we have to rely totally upon Them, because They are the Inheritors of the knowledge of Allah and His Hidden Wisdom.

Is a person's body effected after death?
Many are of the opinion that after death man's body becomes an absolute nothing like a dry wood, hence the question of reckoning in the grave does not arise.Such doubts are the out come of sheer ignorance and lack of belief in the unseen (Ghaib). Speech is the effect of the tongue and movements are impressions of a living body. But the spirit (rooh) is motionless and is hence independent of movements.
Whilst dreaming a man's tongue or his lips do not move, and a person awake will bear witness to it. After awakening the person will narrate the discussions he had with people, he will also claim to have travelled far off cities, but his body in reality having laid motionless on the bed all throughout the night.

Dreams (Ru'ya)
Imam Moosa-al-Kazim (A.S.) states that in the former part of creation, man did not dream. Allah sent upon the people His Apostle to guide them towards virtue and warn against evil. The Prophet advised them that if they followed the Right Path as preached by Him, they would be successful and be rewarded in Paradise.
But if they erred and did not avoid sin, they would face tribulation in hell. They asked the Prophet as to how could they rely on something which they had never seen. They said that they observed that after death a man's body become motionless and turns into dust, how could then he be rewarded or chastised for his actions.
It is after this incident that they started dreaming in which they witnessed Allah's rewards in Paradise and His wath in hell. They went to the Prophet and narrated this to him. The Prophet replied that as in the dreams they met people, conversed with them, and visited far off places, after death even if their bodies would be reduced to dust, they would still taste chastisement or reward (as the case may be) in Paradise or hell.

Death(Maut)
Scholars differ regarding the explanation of death. Some call it a continuous phenomenon (Amre Wujoodi, not the end of life), while others opine that it is terminal one (Amre Adami, the end of life). But the generally excepted fact is that it is purely a bodily affair. Regarding death it is said that, "It is a continuous process and the vice versa to life".
The Holy Qur'an says. Blessed is He in whose hand is the kingdom (of the heavens and the earth), and He has power over all things, Who created death and life that He may try you, (to prove) which of you is best in deeds". (Surah-al Mulk: 1-2) The above verse (Ayah) refers to the purpose of the creation of life and death. Non existence is not the essence of creation.
If death had been an ending process, the word "Khaliq" (Creation) would not have been used. Death in reality is the divorce of the spirit (rooh) from the body, and can be illustrated by many examples. It can be compared to a sailor estranged from his wrecked ship. The spirit is a light which illuminates the dark body and its components derive benefit from it.
Whereas death is the estranger of this light from the body, leaving it again in darkness. It is not true that the spirit enters the body, because it is free of enter and exit. It shares a limited relation with the body, after which it leaves the body for immortality. In short, the detachment of the spirit (Rooh) from the body is called death (Maut).
It is incumbent upon us to believe that death is a phenomenon solely governed by the will and command of Almighty Allah only, and He maintains the relation of the spirit to the body from mother's womb till the end. He is the Creator (Khaliq) of all things, and the Giver of life and death. The Holy Qu'ran says: "Allah takes the spirits (Rooh) at the time of their death" (Surah-az-Zumar : 42). Some ignorant people are of the opinion that the Angel of death (Izraeel) is an evil demon and an enemy who estranges us from our children and orphans them. But the reality is that he acts in accordance to the command of Allah only and has no personal options.

Separation of the Spirit (Rooh) from the body
It is narrated in the tradition of Me'raj that a plank is placed in front of Izraeel, on which names of all creatures are written. When Allah wills death of any one of His creatures, the name on the plank disappears, and Izraeel does the needful. It is possible that at one time death of more than one creature may be ordained. Just as many candles can be extinguished in a single puff, more than one spirit can be removed together. Surely Allah is the giver of death as stated in the Qur'an, "Say (O Prophet) the Angel of death who is given charge of you shall cause you to die.
(Surah-as-Sajdah: 11) In another verse it is stated. "Those whom the Angels cause to die while they are unjust to them selves". (Surah-an-Nahl: 28) Izraeel and his comrade Angels have been assigned the job of removing the spirits of creatures. An army which follows the commands of their king and conquers cities, it is said that the said army has conquered the said cities, but in reality it is the result of the king's military tacts & warfare. Many examples can be given to prove the above, but the fact is that it is beyond comparison.
As Allah has created this world as a house of causes (Darul Asbab), He has also created a cause for death. Disease, murder, accident etc. are some of it's causes. These act as reasons for the approach of death, if not there are instances of persons who recover even after a serious illness, while some die in a blink of an eye.
These causes also do not have an independent option, unless attested by the command and will of the Almighty. Spirits of some men are removed with ease while some experience severe difficulty. It is narrated in traditions (Ahadees) that during death some people feel as if their body is being cut asunder by scissors, or are being grinded in a mill, while some feel as if smelling the fragrance of a rose. It is stated in the Qur'an: "Those whom the Angels cause to die in a good state, saying - Peace be on you, enter the garden (of Paradise) for what you did". (Surah-an-Nahl: 32).
It is not necessary that the spirits of all believers (Mo'mineen) are removed easily. Even a believer who has done good deeds in his life time experiences difficulty during death. This acts as the punishment for sins he committed for which he is atoned for in this very world. While for a non -believer this difficulty is an extra punishment of Allah followed by the ones to come in the Hereafter. "But how will it be when the Angels cause them to die smiting their backs".
(Surah-al-Mohammad: 27) It is also possible that a non-believer may not experience difficulty during death, this acts as reward for the good deeds he has committed which is compensated in this very world, leaving their scrolls of deed of any reward. In reality death is an unfortunate event for a non-believer even though he dies in comfort, while it is a blessing and felicity for a believer even though he experiences difficulty during it.

Love of world:
Hatred towards death and love of the world is the outcome of an ignorant person's mind, who thinks that the happiness of this world is his prosperity and good fortune. The world sated with numerous troubles and anxieties is out to end in misery & does not enjoy eternity, perpetuity and sincerity. A poet has referred to this in the following words - "Do not give your heart to this world, for it's example is of an unfaithful bride who has never loved you, even for a night". The Holy Qur'an says that the love of this world is one of the characteristics of the disbelievers."
(the disbelievers) are pleased with this world's life and are content with it". (Surah -Yunus : 71) In another place it is stated. "Are you contended with the life of this world instead of the Hereafter" (Surah-al-Bara'at : 38). For the jews it is said. " (Every one of them loves that he should be granted a life of a thousand years" (Surah-a1-Baqarah : 96) There are many traditions detesting the love of world. The Holy Prophet (S.A.W.S.) says, "Verily the love of this world is the root--cause of every evil".

Friendship with death:
It is of utmost importance that man should hold death dear and consider it an opportunity of meeting with his Almighty, and not hate it and consider it as evil, but should take lessons from it. He should ask forgiveness from Allah for his sins and tame the rebellious self (nafs). When the call of his Lord comes, he should welcome it with open arms accepting it to be a blessing from Allah. He should be contented with the decree (Qadr) of Allah.
He should also rejoice that shortly he would be taken to the presence of Ahlulbait (A.S.) and meet his deceased companions and other believer brothers. He should also not be disheartened by the delay in death but should consider it as an opportunity afforded by Allah to him to repent. This delay would give him a chance to gather provisions useful for his journey to the other world, for the journey is tiresome and full of dangerous valleys & difficult paths.

Relating to the removal of the Spirit and it's hardships (Sakarat):
"And the stupor of death will come in truth, that is what you were trying of escape". (Surah-al-Qaf : 19). This stage is full of difficulties & troubles. On one hand a man feels pain, his tongue turns motionless, his bodily components cease to function, while on the other hand weeping & wailing of relatives, grief of their separation, orphaning of children, and the sorrow of leaving behind hardly earned wealth and enormous property for others to feast upon. The wealth which was sometimes gathered by usurpation or through illicit means.
The dying man remembers his sins and regrets, but alas, the time (to repent) has passed and accounts closed. Amirul Mo'meneen (A.S.) says, "He (the dying person) regrets over his wealth which he gathered bearing hardships, and now he is being separated from it, leaving it to be feasted upon by his inheritors. His hard earned wealth is left for the use of others." The dying person feels scared, for he is about to enter an unknown & unexplored world, and is all the more freighted when he witnesses those things which are totally new to him.
The Holy Qur'an says, "Certainly you were heedless of it, but now we have removed from you your veil, so your sight today is sharp". (Surah-al-Qaf: 22) He feels the presence of Angels around him and wonders about what is in store for him. It has been narrated in traditions (Ahadees) that at the time of death, the Holy Prophet (S.A.W.S.) and the Holy Aimmah (A.S.) come near the head of the dying person, who is able to see them. It is narrated in third volume of 'Bihar-al-Anwar' that once Imam Ali-ar-Reza (A.S.) went to meet one of his companions (sahabi) who was about to die.
He looked towards the Imam (A.S.) and said, "I see the radiant faces of your Grandfather (the Holy Prophet), Your Father (the Commander of the faithful), Your Mother (Hazrat Fatema), and the other Imams in Your Ancestry. I also see your luminous face along with them". It is a fact that every dying man has a glimpse of the Aimmah (A.S.), according to his love for and knowledge of them. For a believer (mo'min) their sight is a blessing from Allah, and for a hypocrite (munafiq) and disbeliever it is a sign of Allah's wrath. In the Salutation (Ziarat) of Amirul Mo'meneen Ali (A.S.) we utter these words:

السلام على نعمة الله على الأبرار ونقمة الله على الجبار

The dying man is confused, because on one hand Satan (Shaitaan) with his companions tries hard to spoil his faith (Eeman), and on the other hand the thought of the arrival of the Angel of death makes him all the more puzzled. He wonders as to in what state would he (the Angel of death) come and how would his spirit be removed. The Commander of the faithful Ali (A.S.) says, "And when the signs of death approaches, he knows not what will befall him."
Shaikh Kulaini narrates from Imam Ja'far-as-Sadiq (A.S.) who said that once Hazrat Ali (A.S.) was suffering from the ailment of the eye. The Holy Prophet (S.A.W.S.) came to inquire about his health. He saw that Ali (A.S.) was in intense pain and was restless because of it. The Prophet asked him, "Is this anxiety the outcome of the ailment"? Hazrat Ali (A.S.) replied that, "I had never witnessed such a pain before". The Holy Prophet (to console him) said "O Ali! when the Angel of death comes to take the spirit of the disbeliever,he brings along with him a club of fire, by which he removes his spirit and the flames of hell scream at the dying man".
The Commander of the believers sat upright and said, "O Prophet! Please explain to me the tradition (hadees), for I do not fell the pain anymore. Will the spirit of anyone from among your ummat be removed in the same manner"? The Holy Prophet replied, 'Yes, three types of persons from among my ummat too will be subjected to this punishment (1) An oppressive (Zalim) ruler, (2) Those who unjustly usurp the rights of orphans, and (3) The bearer of false witness".
Man due to difficulty or ease during death also sees the effects of his good or bad deeds which he committed. There are also some who turn apostates during death due to some of their bad deeds. "Then evil was the end of those who did evil, because they rejected the communications of Allah and used to mock them". (Surah-ar-Room : 10) It has also been narrated that during death (sakarat) or afterwards, the following persons should not be near the dying man:
a woman in menses (Haiz) or Istahaza (irregular period), and a polluted (Junoob) person, because the Blessed Angels go away and the dying man falls in trouble. Shaikh Sadooq in his book Ilalush Sharaye' quotes Imam Ja'far-as-Sadiq (A.S.) as saying, that woman in menses (Haiz) or a polluted person (Junoob) should not remain near the dying person, because the Angels feel disgusted because of it and go away.
In the book 'Darus Salaam', the great scholar Sayyed Murtaza Najafi quotes: Once an extreme epidemic broke in Iraq and Arabia. I was seated in the courtyard of the Shrine of the Commander of the faithful Ali (A.S.) with a distinguished Scholar (Aalim) Sayyed Mohammad Baqir Qazwini. He was distributing work for serving the effected people among us, when we saw a youth who was standing in the last rank and was struggling to come near the Sayyed, but could not do so because of immense crowd suddenly he started wailing aloud, the Sayyed looked at him and told me to inquire the matter from him.
I went to him and asked him the reason for weeping. He replied, "I desire that if I die in the epidemic, the Sayyed should recite the Prayer (Namaze Mayyit) over my dead body individually and not combined as he does (due to many deaths in the epidemic). I returned to the Sayyed and narrated the matter to him. He promised to fulfill his desire. Next day we saw an infant child who came crying to us. When we inquired of him he answered that he was the son of the youth who had come us yesterday with a desire. lie told us that he had become the victim of epidemic and was about to die, and he was desirous of meeting the Sayyed.
Some of us accompanied Sayyed Mohammad Baqir to meet the dying man. On the way we met a pious man who was coming out of his house. When he saw us he saluted us, and asked us, as to where we were going. We answered that we were going to visit a believer who was in his last moments. With permission he accompanied us in order to share the reward (sawab). When we came to the house, Sayyed Mohammad Baqir entered the room first, then one after the other we entered there in. The dying man was pleased and signalled us to sit. As soon as the pious man who had met us on the way entered, the dying man's colour changed. His face turned pale and in rage signalled him to go away.
He became restless as if some trouble had befallen him. We were all the more surprised when we learnt that the dying man did not even know him, whom we could assume to be his enemy. The man excused himself and went out but returned back after sometime. This time when he entered, the dying person was pleased and welcomed him. After sometime we took permission to leave. On the way we asked the pious man the reason for the sudden change in the attitude of the dying man.
He replied that he was in the state of pollution (Junoob), and was leaving his house with the intention of performing ceremonial bath (Ghusle janabat) in the public bath. He met us on the way, and not wanting to miss the opportunity of performing this noble task accompanied us. He said that when he first entered the house and saw the dying man's restlessness, he understood and left. To make himself sure he returned back after having performed the ceremonial bath (Ghusle Janabat). He concluded that the dying man had come to know about his impurity because the blessed Angels had left him and he felt immense pain. (Khazeenatul Jawaher)

Those deeds whose performance eases death:
Shaikh Sadooq quotes from Imam Ja'far-as-Sadiq (A.S.) that he said, "If a person wishes that his last moments should be easy, he should maintain cordial relations with his kith & kin, and be kind to his parents. Whoever does so, death will be eased, and he will never fall prey to misfortunes in his lifetime".
It is narrated that once the Holy Prophet (S.A.W.S.) went to see a youth who was in his last moments. He told him to recite Kalamae Tawheed (There is no God but Allah), but they youth could not utter it because his tongue had turned speechless. The Prophet repeated his order but with no avail. He repeated it twice but the youth could not answer. The Prophet turned towards a woman who was sat near the youth's head and asked her if she was his mother. She replied in affirmative.
He then asked her if she was unhappy with her son. She answered that she was certainly unhappy, but would forgive him if the Prophet commanded her to do so. The Prophet told her to forgive him. As soon as she forgave, the youth's speech returned and he recited the 'Kalema'. The Prophet asked him as to what he saw. He answered that he saw an ugly looking man who had held him by the neck, and was trying to strangle him. The Prophet told him to recite the following:

يا من يقبل اليسير ويعفو عن الكثير اقبل مني اليسير واعف عني الكثير إنك أنت الغفور الرحيم

When he did so, the Prophet asked him as to what he saw now. He answered that he saw that a handsome man had come to his rescue while the ugly man had turned back. The Prophet ordered him to recite the above du'a again and after having done so asked him what he saw. He replied that the ugly man had left, and the handsome youth was there by his side comforting him. He uttered these words and breathed his last. The above narration should be understood well, and lesson should be learnt that parent's displeasure becomes the reason for anguish in death. Even after being a companion (Sahabi) of the Prophet, and the Prophet being present besides him, the youth could not recite the 'kalema' and was in agony until his mother forgave him.
Imam Ja'far-as-Sadiq (A.S.) says, "For a person who gives clothes to his brother believer during the summer or in winter, it is incumbent upon Allah to present the dress of Paradise to him, make his end easy, and save him from the narrowness of the grave." The Holy Prophet (S.A.W.S.) says, "A person who offers to eat something sweet to his brother believer, the pangs of death will be easy on him".
Those A'mal which prove beneficial during death and eases it's tribulations:
Reciting Surah-al-Yaseen, Surah-as-Saffat and the following supplication (du'a) eases the tribulation during death:

لا إله إلا الله الحليم الكريم. لا إله الله العلي العظيم. سبحان الله رب السموات السبع ورب الأرضين السبع وما فيهن وما بينهن وما فوقهن وماتحتهن وهو رب العرش العظيم والحمد لله رب العالمين.

Shaikh Sadooq narrates from Imam Ja'far-as-Sadiq (A.S.) that he said, "For the person who fasts on the last day of the month of Rajab, Allah will save him from the after effects of death". Fasting on the 24th of Rajab carries great reward (Sawab). One of its merits is that when the Angel of death comes to remove his spirit (Rooh), he comes in the form of a handsome youth carrying a bowl of the pure drink (Sharabe Tahoora) and offers him to drink. The dying person does so and dies in peace.

The Holy Prophet (S.A.W.S.) says that if a person recites four units (Rak'at) Namaz on the night of seventh Rajab in a manner that in each unit (Rak'at) after Surah-al-Hamd recites thrice Surah-at-Tawheed, once Surah-al-Falaq, and once Surah-an-Naas. After finishing the Namaz, sends Salawat on Us and recites ten times Tasbeehate Arba.

سبحان الله والحمد لله ولا اله إلا الله والله اكبر

Almighty Allah will offer him shelter under the Throne (Arsh), and give him reward of a person fasting in the month of Ramazan. Till the time he finishes the prayers, the Angels pray for his forgiveness. Allah will ease the pangs of death on him, and save him from the squeeze in the grave (Fishare Qabr). He will not die until he sees his place in Paradise, and will be safe from the hardships of Resurrection (Qay'amat) Shaikh Kafami quotes from the Holy Prophet (S.A.W.S.), that he said that a person who recites the following supplication (Du'a) 10 times daily,
Allah will forgive four thousand major sins (Gunahane Kabeera) of his, offer him refuge from one hundred thousand calamities at the time of death, the squeeze in the grave (Fishare Qabr) and Qayamat. Allah will also save him from Satan (Sshaitaan) and his army, will pay off his dues and save him from troubles and anxieties.

أعددت لكل هول لا إله إلا الله ولكل غم وهم ما شاءالله ولكل نعمة الحمد لله ولكل رخاء الشكر لله ولكل اعجوبة سبحان الله ولكل ذنب استغفر الله ولكل مصيبة إنا لله وإنا إليه راجعون ولكل ضيق حسبي الله ولكل قضاء وقدر توكلت على الله ولكل عدو اعتصمت بالله ولكل طاعة ومعصية لا حول ولا قوة إلا بالله العلي العظيم.

The recitation of the following du'a seventy times carries great reward. The least of which is that he will be given glad tidings that he will enter Paradise

يا أسمع السامعين ويا أبصر المبصرين و يا أسرع الحاسبين ويا أحكم الحاكمين

Shaikh Kulaini relates from Imam Ja'far-as-Sadiq (A.S.) that he said that the one who recites Surah-az-Zilzal in the Supererogatory Prayers (Nafela), Allah will save him from earthquake, lightening and the calamities of the land and sky. And during death He will send this Surah in the form of a handsome youth who will sit besides him and request the Angel of death (Malekul Maut) to remove his spirit with ease.

Turning away from the Right path during death.
It means that a person should turn away from the Right Path (Sirat-al-Mustaqeem) during death. At the time of death satan (shaitaan) comes to the dying man and tries his best to deceive him and puts him in doubt, so as to turn him away from faith (Eeman). Fakhr Muhaqqeqeen says that, 'A person who wishes to remain safe from the mischief of shaitaan at the time of death should preserve five proofs regarding the fundamental principals of faith (Usool Deen) in his mind, and present it to Allah's custody, so that during death these may come as a handy against shaitaan's deceit. Then he should recite the following supplication (du' a):

اللهم يا أرحم الراحمين إني قد أودعتك يقيني هذا وثبات ديني وأنت مستودع وقد أمرتنا بحفظ الودائع فرده علي وقت حضور موتي

Fakhrul Muhaqqeqeen also says that those who wish to remain safe from shaitaan's mischief of abandoning faith during death, should recite dua'e Adeelah with a pure mind and heart. (Du'ae Adeelah is found in all the renowned books of du'as, and also in the first volume of Mafateehul Jinaan by the same author).
Shaikh Toosi relates from Mohammad b. Sulayman Daylami that I asked Imam Ja'far-as-Sadiq (A.S.) that, "Some of your faithful followers (Shi'ahs) say that faith (Eeman) is of two types: (1) Permanent & firmly established, and (2) One which has been given to us as a trust, and also can be ruined. Please give me a du'a by which my faith may also become permanent and firmly established." Imam (A.S.) told him to recite the following du'a after every obligatory prayers (Wajib Namaz):

رضيت بالله ربّاً وبمحمد صلى الله عليه وآله نبياً وبالإسلام دينا وبالقرآن كتابا وبالكعبة قبلة وبعلي وليّاً وإماماً وبالحسن والحسين وعليّ بن الحسين ومحمد بن علي وجعفر بن محمد وموسى بن جعفر وعلي بن موسى ومحمد بن علي وعلي بن محمد والحسن والحجة بن الحسن صلوات الله عليهم أئمة اللهم إني رضيت بهم أئمّةً فارضني لهم إنك علي كل شيء قدير

Those acts which prove beneficial during death. The best deed is to perform Prayers (Namaz) on time. It is related that there is no person in the east or the west on whom the sight of the Angel of death (Malekul Maut) does not fall at least five times during the time of Prayers. Whenever the time of death of that person comes, the Angel of death (Malekul Maut) recognizes him and helps him to recite Kalema and shuns away Satan (shaitaan) from him. It is narrated that once Imam Ja'far-as-Sadiq (A.S.) wrote to a person:
"Do you wish that you may face death while on the Right path? And do you wish that your spirit (Rooh) may be removed from your body while you be performing good deeds? Then hold Allah's orders dear to yourself and obey them, and do not waste the bounties offered by Him by being disobedient to Him, and do not take undue advantage of His Mercy, nor become arrogant. Honour those who follow Us and respect those who love Us".
The recitation of Dua-e-Tamjeed (Du'a No. 11) of 'Saheefae Kamelah' is beneficial, so as to die while on the Right path and to be saved from turning away from it.
To recite the following supplication (dua) in the Namaz of sundays in the month of Zilqad:

ربنا لا تزغ قلوبنا بعد إذ هديتنا وهب لنا من لدنك رحمة إنك أنت الوهاب

The other beneficial acts are: To always recite Tasbeehe Fatema (A.S.) (34 times Allaho Akbar, 33 times Alhamdo Lillah, and 33 times Sub-hanallah), to wear ring of Carnelian (Aqeeq, specially of red colour), it is better if the following is engraved on it: 'Mohammadun Nabiyyullahe wa Aliyyun Wahyyullahe". To recite Surah-al-Mo'menoon every friday, to recite the following supplication (du'a) seven times after morning (Subh) and evening (Maghrib) Prayers:

بسم الله الرحمن الرحيم لا حول ولا قوة إلا بالله العلي العظيم

To recite 8 units (Rak'at) Namaz on the night of 22nd Rajab, in each unit (Rak'at) after Surah-al-Hamd recites 7 times Surah-at-Tawheed. After ending Namaz, recite 10 times 'Salawat', and 10 times 'Istighfar' (Astagferullah Rabbi wa atoobo Ilayh).
Sayyed ibne Tawoos quotes the Holy Prophet (S.A.W.S.) as saying, that if a person recites 4 units (Rak'ats) Namaz in the month of Sha'ban, such that in each unit (Rak'at) after Surali-al-Hamd recites 50 times Surah-at- Tawheed, then during death his spirit will be removed with ease, and his grave will become spacious, and on the day of Qayamat when he comes out of his grave, his face will be shining bright like a full moon and kalmae Shahadat will be

The following Incidents will prove helpful for further explanation:

Incident - 1
Fuzail bin Ayaz who was one of the great Sufi Saints, says that he had a pious and virtuous student. The student once fell ill, and when his death approached, Fuzail came to visit him and started reciting Surah-al-Yaseen. The student requested Fuzail to stop reciting it. Fuzail then requested him to recite the Kalema, but he refused to do so and said that he was sick of it (Allah's refuge). Fuzail was shocked and felt sad at the attitude of one of his pious students, he returned home and did not come out for some days.
One night he dreamt that the same student was being dragged to the fire of hell by the Angels of wrath. Fuzail stopped them and inquired of his student as to why was he being treated in that manner, when he was always a pious and devout student of his. He asked him as to what was the reason behind his painful end.
The student replied that he had three bad habits in him: (1) Slander, (Woe be on every slanderer & defamer) Surah-al-Humazah: I, (2) Jealousy, (Verily jealousy destroys faith (Eeman) in the same manner as fire destroys wood. - Usool Kafi), and (3) Creating mischief, (creating mischief is graver than murder) - (Surah-al-Baqarah: 217). The student also told Fuzail that he once committed an act which also proved harmful for his Hereafter. He said that once he had a disease, and the doctor had prescribed him to drink wine for it's cure. The doctor told him that if he did not do so he would never be cured. He did as the doctor said. Because of this and the other 3 bad habits his end was such painful, and he died in the state of shame.
For further explanation of the above narrative, I state below an incident quoted by Shaikh Kulaini, who quotes Abu Baseer as saying that, Once I was seated in the presence of Imam Jafar-as-Sadiq (A.S.), when Umme Khalid binte Ma'badiyyah came and told the Imam (A.S.) that since she knew the prohibition of it's use, she had come to the Imam (A.S.) to take advice regarding it. Imam Sadiq (A.S.) asked her, "What stopped you from using it"?
She said that being one of His devout followers, she wished to be saved from shame, and on the day of Qayamat if she be questioned about it she could reply that it's use (or prohibition) was ordered to her by the Imam (A.S.) himself. The Imam (A.S.) turned towards me and said, "O Abu Mohammad! (referred to Abu Baseer), do you pay heed to what this woman says"? Then Imam Sadiq (A.S.) answered By Allah I never give you permission to consume even a drop of it, for if you do so, you shall have to regret when your spirit reaches here", and Imam (A.S.) pointed towards his neck and repeated the sentence thrice, and took the woman's assurance that she had understood it well.

Incident - 2
Shaikh Bahai states in his book 'Kashkol' that there was a person who had spent his entire life in pleasures and luxuries of this world. When he was about to die, the people gathered around him and requested him to recite the 'Kalema'. But instead of the 'Kalema' the dying man said: Where is that woman who in a state of exhaustion came to me and asked me the way to the public bath (named Manjab). He said so because one day a virtuous and beautiful woman came out of her house to have bath in a famous bath house named 'Manjab'.
She forgot her way and was exhausted searching it. She saw this man standing near a door and asked him the way to it. He pointed towards his house and said that the same was the bathhouse named 'Manjab' As soon as the woman entered there in, the man locked the door and in tented to have illicit physical relation with her. The virtuous woman sensed that there was no escape from his lustful fold, and hence pretended to be interested in him. She said that she was a state of uncleanliness and was proceeding for a bath.
She told the man to go and get some scent for her so that she may perfume and adorn herself for him, and also to get something to eat as she was exhausted. The man was deceived by her words and went to the market to buy things. As soon as he stepped outside, the woman thanked Allah for preserving her chastity and ran away. When the man returned, he understood his mistake and regretted. Now when his end neared, her remembered this indecent act and instead of reciting the 'Kalema' said the above words.
The Incident is to be reflected upon that when the person was about to die, the sin (even though he had not committed it, but had in tented) stopped him from reciting the 'Kalema'. Shaikh Kulaini quotes Imam Ja'far-as-Sadiq (A.S.) as saying that, "One who does not pay even one Qeerat of Zakat due on him (Qeerat is equal to 21 dinars), will die the death of a jew or a christian". The same tradition (hadees) is also said about the person who intentionally does not perform Haj even after being capable of doing so.

From Death till Grave
After the spirit (Rooh) is separated from the body, it lingers on the top for sometime. There after the Spirit of the believer is taken to the Heavens, while that of a non- believer below. When a believer's bier is being carried, he calls out: "Hasten me to my eternal destination", while a non-believer calls out: "Do not make haste to bury me in my grave, making way for my chastisement". During bath of the believer's dead body, the Angels ask him if he desires to return to the world back to his kith & kin, to which he replies that he does not intend to go back to the world of miseries and misfortune.
The Spirit of the dead remains present and witnesses the bath given to his body. It is also narrated that when the bath is being performed, the dead person feels as if he is being thrown from height, and the rough hands of the person performing the bath seems to be smiting him. Hence it is necessary that bath should be performed with gentle hands.
The Spirit hears the voices of the people who have come to attend his funeral. Hence it should be borne in mind that one should avoid talking during funeral. A woman in menses or nifaas (blood discharge after child birth), and a person in the state of pollution should avoid coming near the dead body, because it becomes the reason for the displeasure of the blessed Angels, who turn away in disgust. Such acts should be performed for the dead person which become the reason for Allah's blessings, viz. remembrance of Allah and Ahlulbait, (A.S.), recitation of Qur'an etc.
It is also narrated that after the dead body is buried, the spirit returns back and maintains relation with the body. When it sees that the people are returning back, knows that from now on it is destined to live alone. It becomes restless, and says: "Alas! Those children of mine whom I brought up with love and care have abandoned me, and now my only companions are my deeds (A'amal) which I performed while alive". The first glad tidings which a believer receives is in the grave: "Oh you who believe! Allah has forgiven your sins and the sins of those who attended your funeral".