اللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْماً كَثِيراً، وَلَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ، فَاغْفِرْ لِي مَغْفِرَةً مِنْ عِنْدِكَ وَارْحَمْنِي إِنَّكَ أَنْتَ الْغَفُورُ الرَّحِيمُ
Allaahumma innee dhalamtu nafsee dhulman katheeran, wa laa yaghfiruth-thunooba illaa Anta, faghfir lee maghfiratan min indika warhamnee innaka Antal-Ghafoorur-Raheem
O Allah, I have greatly wronged myself and no one forgives sins but You. So, grant me forgiveness and have mercy on me. Surely, you are Forgiving, Merciful.
An-Nasa i: 1303, Al-Bukhari: 834, 6326, 7387, 7388