Repentance

{6:54} And when those who believe in Our communications come to you, say: Peace be on you, your Lord has ordained mercy on Himself, (so) that if any one of you does evil in ignorance, then turns after that and acts aright, then He is Forgiving, Merciful.

{25:71} and whoever repents and does good, he surely turns to Allah a (goodly) turning.

{42:25} and He it is who accepts repentance from His servants and pardons the evil deeds and He knows what you do;