By taqrīr is meant a case where someone performs an act in the presence of the infallible-innocent personality and the latter remains silent while he is aware of what the former is doing and is in the state of capability of informing the former if he is wrong in what he is doing. The state of capability occurs when the time is enough for depiction and when there is no obstacle for that, such as fear, dissimulation, despairing of influence of advising, and the like. Such silence of the infallible-innocent personality and taking no action with regard to what someone has doneis called taqrīr.
Doubtless such an acknowledgment, accompanied by those conditions, is apparent in that such an act is permissible where its prohibition is probable and is lawful and acceptable where it is an act of worship or transaction.For should it be unlawful in the actuality or suffer from deficiency it was upon the infallible-innocent personality to prohibit the doer if he is knowledgeable of what he is doing, because of obligation of commanding to good and prohibiting from bad, and to expound the precept as well as mode of the act if the doer is ignorant of the precept, because of obligation of teaching the ignorant.
The case is the same where someone explains a precept or quality of an act of worship or transaction in the presence of the infallible-innocent personality while he is capable of depiction but he remains silent, since this is acknowledgement of what he has said.
•al-Tarākhī → al-Fawr