Ruling 1523 — Prayer (Ṣalāh)

If someone makes a condition with the hired person to perform an act in a particular manner, the hired person must do so unless he is certain that the particular manner will invalidate the act. If such a condition is not made with him, he must perform the act according to his own duty. And the recommended precaution is that if there is a difference between his duty and that of the deceased’s, he should act according to the duty that is more precautionary; for example, if the duty of the deceased was to say al‑tasbīḥāt al‑arbaʿah three times and his duty is to say it once, then he should say it three times.