ENCOUNTERING EVIL H 185 "Whosoever among you notices something evil should correct it by his hand; if he is unable to do that then he should condemn it by his tongue; if he is unable to do that, he should consider it bad in his heart and this is the lowest degree of faith." R 185 Muslim with a chain up to Abu Sa'id Khudri who related that he heard the Prophet, praise and peace be upon him, say this.
184- وأما الأحاديث : فالأول : عن أبي سعيد الخدري رضي الله عنه ، قَالَ : سَمِعت رَسُول الله صلى الله عليه وآله وسلم ، يقول : "مَنْ رَأى مِنْكُمْ مُنْكَراً فَلْيُغَيِّرْهُ بِيَدِهِ ، فَإنْ لَمْ يَسْتَطِعْ فَبِلِسَانِهِ ، فَإنْ لَمْ يَسْتَطِعْ فَبِقَلْبِهِ ، وَذَلِكَ أضْعَفُ الإيمَانِ" رواه مسلم .