Abu Sa’eed Al-Khudri reported:
The Messenger of Allah, peace and blessings be upon him, said,
“Whoever among you sees evil should change it with his hand. If he is unable to do so, then with his tongue. If he is unable to do so, then with his heart, and that is the weakest level of faith.”
Ṣaḥīḥ Muslim 49
Sahih (authentic) according to Muslim
Sufyan Ath-Thawri, may Allah have mercy on him, said,
“None may enjoin good and forbid evil unless he has three qualities: gentleness in what he enjoins and forbids, justice in what he enjoins and forbids, and knowledge of what he enjoins and forbids.”
Jāmi’ al-‘Ulūm wal-Ḥikam 2/256
عَنْ أَبِي سَعِيدٍ الْخُدْرِيّ رَضِيَ اللهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ رَأَى مِنْكُمْ مُنْكَرًا فَلْيُغَيِّرْهُ بِيَدِهِ فَإِنْ لَمْ يَسْتَطِعْ فَبِلِسَانِهِ فَإِنْ لَمْ يَسْتَطِعْ فَبِقَلْبِهِ وَذَلِكَ أَضْعَفُ الْإِيمَانِ
49 صحيح مسلم كتاب الإيمان باب بيان أن النهي عن المنكر من الإيمان والأن الإيمان يزيد وينقص
قَالَ سُفْيَانُ الثَّوْرِيُّ رحمه الله لَا يَأْمُرُ بِالْمَعْرُوفِ وَيَنْهَى عَنِ الْمُنْكَرِ إِلَّا مَنْ كَانَ فِيهِ خِصَالٌ ثَلَاثٌ رَفِيقٌ بِمَا يَأْمُرُ رَفِيقٌ بِمَا يَنْهَى عَدْلٌ بِمَا يَأْمُرُ عَدْلٌ بِمَا يَنْهَى عَالِمٌ بِمَا يَأْمُرُ عَالِمٌ بِمَا يَنْهَى
2/256 جامع العلوم والحكم