(As for) those who disbelieve and turn away from Allah's way, He shall render their works ineffective.
And (as for) those who believe and do good, and believe in what has been revealed to Muhammad, and it is the very truth from their Lord, He will remove their evil from them and improve their condition.
That is because those who disbelieve follow falsehood, and have given them their dowries, taking (them) in marriage, not fornicating nor taking them for paramours in secret; and whoever denies faith, his work indeed is of no account, and in the hereafter he shall be one of the losers.
So when you meet in battle those who disbelieve, then smite the necks until when you have overcome them, then make (them) prisoners, and afterwards either set them free as a favor or let them ransom (themselves) until the war terminates. That (shall be so); and if Allah had pleased He would certainly have exacted what is due from them, but that He may try some of you by means of others; and (as for) those who are slain in the way of Allah, He will by no means allow their deeds to perish.