Hadith on Oppression: Help the oppressed, stop the oppressor

Jabir ibn Abdullah reported: Two young men were fighting, one from the Muhajirin and one man from the Ansar. The Muhajir called out, “O Muhajirin!” And the Ansari called out, “O Ansar!” The Messenger of Allah, peace and blessings be upon him, came out and he said, “What is this call of the people of ignorance?” They said, “O Messenger of Allah, it is only two boys fighting and one had kicked the other.” The Prophet said, “No matter, let a man help his brother whether he is wrong or being wronged. If he is oppressing others, then stop him, for that is supporting him. If he is being oppressed, then support him.”

Source: Ṣaḥīḥ Muslim 2584

Grade: Sahih (authentic) according to Muslim

عَنْ جَابِرٍ قَالَ اقْتَتَلَ غُلاَمَانِ غُلاَمٌ مِنَ الْمُهَاجِرِينَ وَغُلاَمٌ مِنَ الأَنْصَارِ فَنَادَى الْمُهَاجِرُ أَوِ الْمُهَاجِرُونَ يَا لَلْمُهَاجِرِينَ وَنَادَى الأَنْصَارِيُّ يَا لَلأَنْصَارِ فَخَرَجَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ مَا هَذَا دَعْوَى أَهْلِ الْجَاهِلِيَّةِ قَالُوا لاَ يَا رَسُولَ اللَّهِ إِلاَّ أَنَّ غُلاَمَيْنِ اقْتَتَلاَ فَكَسَعَ أَحَدُهُمَا الآخَرَ قَالَ فَلاَ بَأْسَ وَلْيَنْصُرِ الرَّجُلُ أَخَاهُ ظَالِمًا أَوْ مَظْلُومًا إِنْ كَانَ ظَالِمًا فَلْيَنْهَهُ فَإِنَّهُ لَهُ نَصْرٌ وَإِنْ كَانَ مَظْلُومًا فَلْيَنْصُرْهُ

2584 صحيح مسلم كتاب البر والصلة والآداب باب نصر الأخ ظالما أو مظلوما