Al-Ma'idah' - 5:39

فَمَن تَابَ مِن بَعْدِ ظُلْمِهِ وَأَصْلَحَ فَإِنَّ اللّهَ يَتُوبُ عَلَيْهِ إِنَّ اللّهَ غَفُورٌ رَّحِيمٌ
[5:39]
But whoever repents after his iniquity and reforms (himself), then surely Allah will turn to him (mercifully); surely Allah is Forgiving, Merciful.
But if the thief repents after his crime, and amends his conduct, Allah turneth to him in forgiveness; for Allah is Oft-forgiving, Most Merciful.
But whoso repenteth after his wrongdoing and amendeth, lo! Allah will relent toward him. Lo! Allah is Forgiving, Merciful.