Sura 3 Ali 'Imran (Family of Imran), aya 135

1. وَالَّذِينَ إِذَا فَعَلُوا فَاحِشَةً أَوْ ظَلَمُوا أَنْفُسَهُمْ ذَكَرُوا اللَّهَ فَاسْتَغْفَرُوا لِذُنُوبِهِمْ وَمَنْ يَغْفِرُ الذُّنُوبَ إِلَّا اللَّهُ وَلَمْ يُصِرُّوا عَلَىٰ مَا فَعَلُوا وَهُمْ يَعْلَمُونَ

   And those who, when they commit an immorality or wrong themselves (by transgression), remember Allah and seek forgiveness for their sins - and who can forgive sins except Allah? - and (who) do not persist in what they have done while they know.

   3:135

Tafsiri: Saheeh International