فَإِذا لَقيتُمُ الَّذينَ كَفَروا فَضَربَ الرِّقابِ حَتّىٰ إِذا أَثخَنتُموهُم فَشُدُّوا الوَثاقَ فَإِمّا مَنًّا بَعدُ وَإِمّا فِداءً حَتّىٰ تَضَعَ الحَربُ أَوزارَها ۚ ذٰلِكَ وَلَو يَشاءُ اللَّهُ لَانتَصَرَ مِنهُم وَلـٰكِن لِيَبلُوَ بَعضَكُم بِبَعضٍ ۗ وَالَّذينَ قُتِلوا في سَبيلِ اللَّهِ فَلَن يُضِلَّ أَعمالَهُم

So when you meet those who disbelieve [in battle], strike [their] necks until, when you have inflicted slaughter upon them, then secure their bonds, and either [confer] favor afterwards or ransom [them] until the war lays down its burdens. That [is the command]. And if Allah had willed, He could have taken vengeance upon them [Himself], but [He ordered armed struggle] to test some of you by means of others. And those who are killed in the cause of Allah - never will He waste their deeds.