Sayyid al-Istighfar (The Master Supplication for Forgiveness)

اللَّهُمَّ أَنْتَ رَبِّي لَا إِلَٰهَ إِلَّا أَنْتَ خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَىٰ عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ أَبُوءُ لَكَ بِنِعْمَتِكَ عَلَيَّ وَأَبُوءُ بِذَنْبِي فَاغْفِرْ لِي فَإِنَّهُ لَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ

Allāhumma Anta Rabbī lā ilāha illā Anta, khalaqtanī wa anā ʿabduka wa anā ʿalā ʿahdika wa waʿdika mas-taṭaʿtu...

O Allah, You are my Lord, there is no god but You. You created me and I am Your servant, and I abide by Your covenant and promise as best I can...