An-Nawawi’s Hadith No.34
On the authority of Abu Saeed Al-Khurdari (Radhiallaho anha), who said:
I heard the Messenger of Allah (Sallallaahu 'alaihi wasallam), 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.
