Al-Hajj 22:39

Othina lillatheena yuqataloonabi-annahum thulimoo wa-inna Allaha AAalanasrihim laqadeer

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.

Permission (to fight) is given to those against whom fighting is launched, because they have been wronged, and Allah is powerful to give them victory.