Hadith # 34 
On the authority of Abu Saeed Al-Khurdari, who said: I heard the messenger of Allah say: 
 "Whosoever of you sees an evil action, let him change it with his hand; and if he is not able to do so, then with his tongue; and if he is not able to do so, then with his heart; and that is the weakest of faith."
- related by Muslim.

