Chapter: After the last tashahhud and before salam

Status Reference : Hisn al-Muslim 57

اللّهُـمَّ إِنِّـي ظَلَـمْتُ نَفْسـي ظُلْمـاً كَثـيراً
وَلا يَغْـفِرُ الذُّنـوبَ إِلاّ أَنْت،
فَاغْـفِر لي مَغْـفِرَةً مِنْ عِنْـدِك وَارْحَمْـني،
إِنَّكَ أَنْتَ الغَـفورُ الرَّحـيم

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English Translation:

Allāhumma ‘innī ẓalamtu nafsī ẓulman kathīran,
wa lā yaghfiru-dhdhunūba illā ‘anta,
faghfir lī maghfiratam’min `indika warḥamnī
innaka ‘anta ‘l-Ghafūr ur-Rahīm.

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.

Reference:
Al-Bukhari 8/168, Muslim 4/2078.