O Allah, accept my repentance, wash my sins, answer my supplication, and make fi — Repentance
اللَّهُمَّ تَقَبَّلْ تَوْبَتِي وَاغْسِلْ حَوْبَتِي وَأَجِبْ دَعْوَتِي وَثَبِّتْ حُجَّتِي
Transliteration: Allaahumma taqabbal tawbatee waghsil hawbatee wa ajib da'watee wa thabbit hujjatee
Translation: O Allah, accept my repentance, wash my sins, answer my supplication, and make firm my proof.
Reference: Abu Dawud 2:85