So when you are to fight (for the elimination of militancy and terrorism) against the (warring) disbelievers (in the battlefield), strike their necks (while fighting because they took innocent human lives and destroyed peace by their terrorist activities) till, when you have killed a good many of them (in the battle), then tie (the remaining prisoners) tightly. Thereafter either set (them) free (without ransom) as a favour or (free them) for ransom (i.e. cost of freedom) till the warring (hostile army) lays down its weapons (i.e. announces the truce). That is (the command). And if Allah had willed, He would have avenged Himself on them (without war). But (He did not do so) in order to try some of you by means of others. And as for those who are slain in the way of Allah, He will not at all make their actions fruitless.