رَبِّ اغْفِرْ لي، وَتُبْ عَلَـيَّ، إِنَّكَ أَنْتَ التَّوَّابُ الغَفُورُ

O my Lord, forgive me and turn towards me (to accept my repentance). Verily You are the Oft-Returning, the Oft-Forgiving.

Reference: O my Lord, forgive me and turn towards me (to accept my repentance). Verily You are the Oft-Returning, the Oft-Forgiving. Al-Tirmidhī (#3432). Also see _Ṣaḥīḥ al-Tirmidhī_ (3/153) and _Ṣaḥīḥ Ibn Mājah_ (2/321) and the wording is al-Tirmidhī's.