أُذِنَ لِلَّذِينَ يُقَاتَلُونَ بِأَنَّهُمْ ظُلِمُوا وَإِنَّ اللَّهَ عَلَى نَصْرِهِمْ لَقَدِيرٌ
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سورة الحج
(22/39) Permission is given to those who are fighting (to fight), because they have been wronged; and most surely Allah is capable to help them.
Surah Al-Hajj