The Ruling on Mentioning the Errors of the Deceased

Question:
And it is not a matter of anything. Or that the one who has corrupted the hearts of the people regarding the doubts concerning those under his care, whom he did not see in his life or at the beginning, or that he judges the rest of Islam and the Muslims, the Muslims, by his books and his sayings, and it was not the case that anyone with him was anyone.

Answer:
No, this does not lead to benefit; he is cursed, and this does not lead to benefit, but one should warn of his errors. It is said, "So-and-so committed such and such, and in his such-and-such book he mentioned such and such, so let one beware of it." As for cursing him, disparaging him, and insulting him, there is no need for that. Because the purpose is to clarify his errors so that people are not deceived by them. Or so that one of his followers who does not know about it is alerted to it so that he does not continue on his path. As for taking his personality and cursing it, or abusing it, or insulting it, there is no need for that.