The ruling on praying behind an imam who curses and reviles people and does not stand in the mosque as he should

Question:
May Allah reward you with good and do you well. There is an imam of a mosque who is not upright in his life; that is, he curses and reviles people and does not stand in the mosque in a complete manner. Is it permissible to pray behind him? Knowing that some people do not know anything about him, should we advise those who do not know anything about him, or should we remain silent? May Allah reward you with good?

Answer:
If his belief is sound and there is no defect in his creed, the prayer behind him is valid. However, he should be advised regarding foul language, cursing, reviling, and harming people. He should be advised about this because he is a role model; the imam is a role model whom people follow. If he does not comply, then it is recommended that he be replaced by someone else from among the upright people. As for the prayer behind him, it is valid as long as there is no defect in his creed. Yes.