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An-Nawawy’s Forty Hadiths: (34) Concept of Enjoining What Is Good and Discouraging What Is Evil
On the authority of Abu Sa`eed al-Khudree (may Allah be pleased with him) who said, "I heard the Messenger of Allah (ﷺ) say, 'Whosoever of you sees an evil, let him change it with his hand; and if he is not able to do so, then [let him change it] with his tongue; and if he is not able to do so, then with his heart — and that is the weakest of faith." (Muslim)
