Sunan an-Nasa'i, Book 47, Hadith 25 (In-Book) ⓘ

It was narrated that Tariq bin Shihab said: "Abu Sa'eed Al-Khudri said: 'I heard the Messenger of Allah [SAW] say: Whoever among you sees an evil and changes it with his hand, then he has done his duty. Whoever is unable to do that, but changes it with his tongue, then he has done his duty. Whoever is unable to do that, but changes it with his heart, then he has done his duty, and that is the weakest of Faith.'"

حَدَّثَنَا عَبْدُ الْحَمِيدِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا مَخْلَدٌ، قَالَ حَدَّثَنَا مَالِكُ بْنُ مِغْوَلٍ، عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، قَالَ قَالَ أَبُو سَعِيدٍ الْخُدْرِيُّ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ مَنْ رَأَى مُنْكَرًا فَغَيَّرَهُ بِيَدِهِ فَقَدْ بَرِئَ وَمَنْ لَمْ يَسْتَطِعْ أَنْ يُغَيِّرَهُ بِيَدِهِ فَغَيَّرَهُ بِلِسَانِهِ فَقَدْ بَرِئَ وَمَنْ لَمْ يَسْتَطِعْ أَنْ يُغَيِّرَهُ بِلِسَانِهِ فَغَيَّرَهُ بِقَلْبِهِ فَقَدْ بَرِئَ وَذَلِكَ أَضْعَفُ الإِيمَانِ ‏" ‏ ‏.‏