What is the ruling on one who doubts whether he recited al-Fatihah in his prayer or not?

Question:
Sometimes I listen to the imam's recitation, and I am afflicted with doubt: Did I recite al-Fatihah or not? And sometimes I do not recite it and say: This is from the whispers of Satan. What is the ruling on my previous action?

Answer:
The original ruling is that he recited it, as long as he is behind the imam. He should leave the whispers, strive to recite it, and be diligent, and leave the whispers; because Satan is eager to corrupt the prayer of the children of Adam.
Q: In the loud prayer, if I did not recite it?
A: Just as he doubts: Did he say: Glory be to my Lord, the Most High? Did he say: Glory be to my Lord, the Most Exalted? Did he recite the tashahhud? Satan whispers to him and plays with him.
Q: Does the imam bear it?
A: If the ma'mum is ignorant, or forgetful, or he did not arrive until the imam was in ruku' or at the time of ruku', then the imam bears it.
Q: If he did not recite al-Fatihah in the loud prayer?
A: It is obligatory for him; he must not intentionally leave it, unless he is ignorant, in which case the imam bears it.
Q: If he is unable to recite it?
A: It is not obligatory for him to recite it, even if the imam recited it, and even if he did not know it.
Q: And if he did not recite it?
An ignorant person owes nothing, and if he was forgetful, he owes nothing, and if he intentionally left it while knowing the legal ruling, his prayer is invalid according to the correct opinion.