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 مَنْ رَأَى مِنْكُمْ مُنْكَرًا فَلْيُغَيِّرْهُ بِيَدِهِ، فَإِنْ لَمْ يَسْتَطِعْ فَبِلِسَانِهِ، فَإِنْ لَمْ يَسْتَطِعْ فَبِقَلْبِهِ، وَذلِكَ أَضْعَفُ الإِيْمَان

 رَوَاهُ مُسْلِمٌ

On the authority of Abu Sa'id al-Khudri, radiyallahu 'anhu, who said: I heard the Messenger of Allah, sallallahu 'alayhi wasallam, say:

"When any one of you sees anything that is disapproved (of by Allah), let him change it with his hand. 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 let him change it with his heart, though that is the weakest (kind of) faith."

[Muslim]