أُذِنَ لِلَّذِينَ يُقَـٰتَلُونَ بِأَنَّهُمْ ظُلِمُوا۟ ۚ وَإِنَّ ٱللَّهَ عَلَىٰ نَصْرِهِمْ لَقَدِيرٌ
Permission [to fight] has been given to those who are being fought, because they were wronged. And indeed, Allāh is competent to give them victory.
Al-Hajj, 39