The Need for Evidence and Explanation When Advising Against Wrongs

Imām Ibn Taimiyyah, may Allāh have mercy on him, said:

From the things that must be known is that one who wants to tell people something is wrong [Islamically], it’s not for him to say something is wrong except with evidence and explanation, since no one has the right to make something binding on someone or to prohibit someone from something without specific evidence other than the Messenger of Allāh ﷺ, the one who conveyed [the religion] from Allāh.

Majmūʿ Al-Fatāwá, vol. 3, p. 245.