Does the one who prays choose whatever supplications he wishes in his prostration, or is he restricted to what is reported in the evidence?

Question:
May Allah reward you. The sender, F. 'A. N., sent a message containing several questions. In the first one, he asks: Does a person have the choice to say whatever he wishes in the prostration of prayer, specifically regarding supplication, or is it obligatory for him to say "Subhana Rabbi al-A'la" (Glory be to my Lord, the Most High)? And likewise, after the tashahhud, may he supplicate with whatever supplications he wishes?

Answer:
Yes. Saying "Subhana Rabbi al-A'la" in the prostration is obligatory once, and anything more than that is recommended. It is also recommended for him to supplicate and strive in his supplication. His saying (peace and blessings be upon him) contains supplication, so hope that it will be answered for you. He should supplicate with whatever beneficial supplications are easy for him, for himself and for the Muslims in general. This is the supplication in prostration; it is recommended, and he should supplicate with whatever comprehensive and beneficial supplications are easy for him, and strive in that, because this is one of the places where supplication is answered. Yes.