Al-Hajj 39

أُذِنَ لِلَّذِينَ يُقَٰتَلُونَ بِأَنَّهُمْ ظُلِمُوا۟ وَإِنَّ ٱللَّهَ عَلَىٰ نَصْرِهِمْ لَقَدِيرٌ ﴿٣٩﴾

Othina lillatheena yuqataloona biannahum thulimoo wainna Allaha AAala nasrihim laqadeerun

Permission to fight is given to those (i.e. believers against disbelievers), who are fighting them, (and) because they (believers) have been wronged, and surely, Allah is Able to give them (believers) victory The Noble Quran