On the authority of Abu Sa’eed al-Khudree (ra) who said: I heard the Messenger of Allah (saw) say,
“Whoso- ever 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.”
