The ruling on praying behind an imam who does not recite al-Fatihah well?

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: An imam recites in the prayer , but he does not hold the long alif after the 'ayn, so he says "al-hamdu lillahi Rabb al-'alamin" or "al-'alamin." What is the ruling on his prayer? And what is the ruling on the prayer of those behind him?

Answer:
If he recites well, and if he is pointed out to it, then it is not permissible to pray behind him. It is obligatory for him to learn the correct recitation, and it is not permissible for him to remain with an incorrect recitation. As for if he does not recite well, and even if he knows, he is unable to do so, like the alif, then his prayer is valid for him. As for those behind him, their prayer is not valid.