Al-Anfal - 8:38

قُل لِلَّذِينَ كَفَرُواْ إِن يَنتَهُواْ يُغَفَرْ لَهُم مَّا قَدْ سَلَفَ وَإِنْ يَعُودُواْ فَقَدْ مَضَتْ سُنَّةُ الأَوَّلِينِ
[8:38]
Say to those who disbelieve, if they desist, that which is past shall be forgiven to them; and if they return, then what happened to the ancients has already passed.
Say to the Unbelievers, if (now) they desist (from Unbelief), their past would be forgiven them; but if they persist, the punishment of those before them is already (a matter of warning for them).
Tell those who disbelieve that if they cease (from persecution of believers) that which is past will be forgiven them; but if they return (thereto) then the example of the men of old hath already gone (before them, for a warning).