Mentioning religious innovations and their adherents for the purpose of warning, and its relationship to backbiting

Question:
He says: Honorable Shaykh, may Allah grant you success, does mentioning the religious innovations (bid'ah) that a person has, mentioning him by name, and warning against him count as backbiting?

Answer:
It is not backbiting; this is advice to the Muslims. The scholars mention the defects found in narrators in order to preserve the Sunnah and preserve the religion. So if this person has errors in matters of knowledge and matters of religion, it is necessary to clarify them as advice to the Muslims, and that is not from the category of backbiting, but rather from the category of advice to the Muslims. However, as much as possible, if a person is not mentioned or nothing is said about him that would harm him, as much as that is possible, a person should avoid it; he should limit himself to clarifying the error that occurred and not address the person. But if the matter requires clarifying the person's condition, then it is necessary to clarify his condition, just as the conditions of narrators are clarified, even if they are righteous, and even if they are people of knowledge, their conditions are clarified in order to advise the Muslims not to be deceived by this matter.