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Narrated Anas:

Allah's Apostle ﷺ said, "Help your brother, whether he is an oppressor or he is an oppressed one. People asked, "O Allah's Apostle! It is all right to help him if he is oppressed, but how should we help him if he is an oppressor?" The Prophet ﷺ said, "By preventing him from oppressing others."
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا مُعْتَمِرٌ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ انْصُرْ أَخَاكَ ظَالِمًا أَوْ مَظْلُومًا ‏"‏‏.‏ قَالُوا يَا رَسُولَ اللَّهِ هَذَا نَنْصُرُهُ مَظْلُومًا، فَكَيْفَ نَنْصُرُهُ ظَالِمًا قَالَ ‏"‏ تَأْخُذُ فَوْقَ يَدَيْهِ ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 2444
• Sahih al-Bukhari, Vol. 3, Book of Oppressions, Hadith 624
• Sahih al-Bukhari, Book of Oppressions, Hadith 624