وَالَّذِينَ إِذَا فَعَلُواْ فَاحِشَةً أَوْ ظَلَمُواْ أَنْفُسَهُمْ ذَكَرُواْ اللّهَ فَاسْتَغْفَرُواْ لِذُنُوبِهِمْ وَمَن يَغْفِرُ الذُّنُوبَ إِلاَّ اللّهُ وَلَمْ يُصِرُّواْ عَلَى مَا فَعَلُواْ وَهُمْ يَعْلَمُونَ
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سورة آل عمران
(3/135) And they (owners of piety), when they do wrong or harm their souls, do Zikir (remember the name of Allah) and ask forgiveness for their sins. And who forgives the sins except Allah? And they do not knowingly persist in what they have done (wrong).
Surah Al Imran