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In the Name of Allah, the Clement, the Merciful And if two groups of believers fight each other, reconcile them. If one of them assaults the other still, then fight the aggressor till they comply with the law of Allah. If they comply, then reconcile them with justice and be equitable. Allah loves those who are equitable. Believers are brothers to each other. Establish agreement among your brothers, and fear Allah, so that we grant you mercy.
Fouzi Slisli (Sat,) studied this question.