Al Hujurat, 9 Ayah
49:9
وَإِن طَآئِفَتَانِ مِنَ ٱلۡمُؤۡمِنِينَ ٱقۡتَتَلُواْ فَأَصۡلِحُواْ بَيۡنَهُمَاۖ فَإِنۢ بَغَتۡ إِحۡدَىٰهُمَا عَلَى ٱلۡأُخۡرَىٰ فَقَٰتِلُواْ ٱلَّتِي تَبۡغِي حَتَّىٰ تَفِيٓءَ إِلَىٰٓ أَمۡرِ ٱللَّهِۚ فَإِن فَآءَتۡ فَأَصۡلِحُواْ بَيۡنَهُمَا بِٱلۡعَدۡلِ وَأَقۡسِطُوٓاْۖ إِنَّ ٱللَّهَ يُحِبُّ ٱلۡمُقۡسِطِينَ ٩
Wa 'In Ţā'ifatāni Mina Al-Mu'uminīna Aqtatalū Fa'aşliĥū Baynahumā ۖ Fa'in Baghat 'Iĥdāhumā `Alá Al-'Ukhrá Faqātilū Allatī Tabghī Ĥattá Tafī'a 'Ilá 'Amri Al-Lahi ۚ Fa'in Fā'at Fa'aşliĥū Baynahumā Bil-`Adli Wa 'Aqsiţū ۖ 'Inna Al-Laha Yuĥibbu Al-Muqsiţīna
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 Allah . And if it returns, then make settlement between them in justice and act justly. Indeed, Allah loves those who act justly.