The ruling on the prayer of one who doubts whether he recited al-Fatihah

Q: During my prayer, I forgot that I had recited al-Fatihah. Should I perform the prostration for forgetfulness? What does a person recite during the prostration for forgetfulness? And if it is most likely that I did recite it, should I still perform the prostration for forgetfulness?

A: If the praying person, whether praying alone or leading the prayer, doubts whether he recited al-Fatihah, he must repeat the recitation before bowing, and he does not have to perform the prostration for forgetfulness.
As for if the doubt occurs after he has finished the prayer, he should not pay attention to it, and his prayer is valid; because the original state is that it is sound.
As for the one praying behind the imam: his prayer is valid if he forgets to recite al-Fatihah, and the imam bears it for him in this case, just as if he left it out due to ignorance. Likewise, if he arrives and the imam is in bowing, he says the takbir while standing, then bows with the imam, and the rak'ah suffices for him, and al-Fatihah is dropped from him in this case because he did not catch the standing; due to the hadith of Abu Bakrah regarding this.
As for the prostration for forgetfulness, what is prescribed in it is what is prescribed in the prostration of prayer, such as supplication and saying "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High) and the like. And success is from Allah.