Mujámmad 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

Now when ye meet in battle those who disbelieve, then it is smiting of the necks until, when ye have routed them, then making fast of bonds; and afterward either grace or ransom till the war lay down its burdens. That (is the ordinance). And if Allah willed He could have punished them (without you) but (thus it is ordained) that He may try some of you by means of others. And those who are slain in the way of Allah, He rendereth not their actions vain.

Therefore, when ye meet the Unbelievers (in fight), smite at their necks; At length, when ye have thoroughly subdued them, bind a bond firmly (on them): thereafter (is the time for) either generosity or ransom: Until the war lays down its burdens. Thus (are ye commanded): but if it had been Allah's Will, He could certainly have exacted retribution from them (Himself); but (He lets you fight) in order to test you, some with others. But those who are slain in the Way of Allah,- He will never let their deeds be lost.