Surah Ali 'Imran — Ayah 135 (3:135)
وَٱلَّذِينَ إِذَا فَعَلُواْ فَٰحِشَةً أَوۡ ظَلَمُوٓاْ أَنفُسَهُمۡ ذَكَرُواْ ٱللَّهَ فَٱسۡتَغۡفَرُواْ لِذُنُوبِهِمۡ وَمَن يَغۡفِرُ ٱلذُّنُوبَ إِلَّا ٱللَّهُ وَلَمۡ يُصِرُّواْ عَلَىٰ مَا فَعَلُواْ وَهُمۡ يَعۡلَمُونَ ١٣٥
English translation (Saheeh International)
And those who, when they commit an immorality or wrong themselves [by transgression], remember Allāh and seek forgiveness for their sins - and who can forgive sins except Allāh? - and [who] do not persist in what they have done while they know.
Brief commentary
They are the ones; if they were to commit a major sin, or wrong themselves by committing a lesser sin, they remember Allah, and His warning to the wrongdoers and promise to the Mindful; so they ask their Lord for forgiveness, regretting what they did. They ask Allah not to take them to account for it, because Allah alone can forgive, and they do not continue in their disobedience. They know that they have done wrong and that Allah forgives all disobedience.