If a man prays beside you and makes a mistake in his prayer, are you required to alert him?

Question : And is it obligatory for those who are not praying behind an imam to alert him, such as if a man is praying next to you? For example, if he stands up for an extra unit of prayer, and he is not your imam, are you required to alert him?

Answer : Yes, it appears that you are required to alert him, because this falls under the category of giving advice, enjoining good and forbidding evil. On this basis, the author’s statement is based on the common case. Yes.