Surah Al-Hujurat, verse 8

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِن جَآءَكُمْ فَاسِقٌۢ بِنَبَإٍۢ فَتَبَيَّنُوٓا۟ أَن تُصِيبُوا۟ قَوْمًۢا بِجَهَـٰلَةٍۢ فَتُصْبِحُوا۟ عَلَىٰ مَا فَعَلْتُمْ نَـٰدِمِينَ ﴿٦﴾

O you who have believed, if there comes to you a disobedient one with information, investigate, lest you harm a people out of ignorance and become, over what you have done, regretful.

وَٱعْلَمُوٓا۟ أَنَّ فِيكُمْ رَسُولَ ٱللَّهِ ۚ لَوْ يُطِيعُكُمْ فِى كَثِيرٍۢ مِّنَ ٱلْأَمْرِ لَعَنِتُّمْ وَلَـٰكِنَّ ٱللَّهَ حَبَّبَ إِلَيْكُمُ ٱلْإِيمَـٰنَ وَزَيَّنَهُۥ فِى قُلُوبِكُمْ وَكَرَّهَ إِلَيْكُمُ ٱلْكُفْرَ وَٱلْفُسُوقَ وَٱلْعِصْيَانَ ۚ أُو۟لَـٰٓئِكَ هُمُ ٱلرَّٰشِدُونَ ﴿٧﴾

And know that among you is the Messenger of Allāh. If he were to obey you in much of the matter, you would be in difficulty, but Allāh has endeared to you the faith and has made it pleasing in your hearts and has made hateful to you disbelief, defiance and disobedience. Those are the [rightly] guided.

وَإِن طَآئِفَتَانِ مِنَ ٱلْمُؤْمِنِينَ ٱقْتَتَلُوا۟ فَأَصْلِحُوا۟ بَيْنَهُمَا ۖ فَإِنۢ بَغَتْ إِحْدَىٰهُمَا عَلَى ٱلْأُخْرَىٰ فَقَـٰتِلُوا۟ ٱلَّتِى تَبْغِى حَتَّىٰ تَفِىٓءَ إِلَىٰٓ أَمْرِ ٱللَّهِ ۚ فَإِن فَآءَتْ فَأَصْلِحُوا۟ بَيْنَهُمَا بِٱلْعَدْلِ وَأَقْسِطُوٓا۟ ۖ إِنَّ ٱللَّهَ يُحِبُّ ٱلْمُقْسِطِينَ ﴿٩﴾

And if two factions among the believers should fight, then make settlement between the two. But if one of them oppresses the other, then fight against the one that oppresses until it returns to the ordinance of Allāh. And if it returns, then make settlement between them in justice and act justly. Indeed, Allāh loves those who act justly.

إِنَّمَا ٱلْمُؤْمِنُونَ إِخْوَةٌۭ فَأَصْلِحُوا۟ بَيْنَ أَخَوَيْكُمْ ۚ وَٱتَّقُوا۟ ٱللَّهَ لَعَلَّكُمْ تُرْحَمُونَ ﴿١٠﴾

The believers are but brothers, so make settlement between your brothers. And fear Allāh that you may receive mercy.