What is the ruling on praying behind the imam of a mosque who is an open sinner?

Question : He says: If the imam of the mosque is an open sinner who admits to committing a major sin, what is the ruling on praying behind him?

Answer : There is nothing wrong with it, but you should not pray behind him unless you cannot find anyone else. If the imam is known for open sinfulness, may Allah protect us from that, and he persists in his disobedience, but he is the regular imam, then pray behind him, on the condition that that sin does not invalidate the prayer. If it invalidates the prayer, such as if we know that this man is praying while he has not performed the full ritual bath from major ritual impurity, do we pray behind him? No, because he has no prayer. If you pray behind him while knowing that he has no prayer, then it is a waste. But if his sin does not invalidate the prayer, then his sin is upon himself. However, if you find someone else, do not pray behind him. Yes.