On the authority of Abu Sa’eed al-Khudree (may Allah be pleased with him) who said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) 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.”