Dalil
العربية

Quran Al-Hajj 22:39

أُذِنَ لِلَّذِينَ يُقَٰتَلُونَ بِأَنَّهُمۡ ظُلِمُواْۚ وَإِنَّ ٱللَّهَ عَلَىٰ نَصۡرِهِمۡ لَقَدِيرٌ

Translation

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.