اَللَّهُمَّ اغْفِرْ لِيْ ذُنُوْبِيْ وَخَطَئِيْ وَعَمْدِيْ

Allahummagfirli zunubi wa khatayi wa ‘amadi

O Allah, forgive my (all) sins. Even unintentional sins, even sins committed willingly.

Reference: Sahih (Albani). Sahih Al-Mawarid 2059