When you meet those who deny the truth in battle, strike them in the neck, and once they are defeated, make [them] prisoners, and afterwards either set them free as an act of grace, or let them ransom [themselves] until the war is finally over. Thus you shall do; and if God had pleased, He would certainly have exacted retribution from them, but His purpose is to test some of you by means of others. As for those who are killed in God's cause, He will never let their deeds be in vain;