Muhammad 47:4 فاذا لقيتم الذين كفروا فضرب الرقاب حتى اذا اثخنتموهم فشدوا الوثاق فاما منا بعد واما فداء حتى تضع الحرب اوزارها ذالك ولو يشاء الله لانتصر منهم ولاكن ليبلو بعضكم ببعض والذين قتلوا في سبيل الله فلن يضل اعمالهم ٤

When you meet the disbelievers in battle, strike them in the neck, and once they are defeated, bind any captives firmly––later you can release them by grace or by ransom––until the toils of war have ended. That [is the way]. God could have defeated them Himself if He had willed, but His purpose is to test some of you by means of others. He will not let the deeds of those who are killed for His cause come to nothing;