Sayyid al-Istighfar (the master of seeking forgiveness)

اللَّهُمَّ أَنْتَ رَبِّي لَا إِلَهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ، وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ...

Allahumma anta Rabbi, la ilaha illa ant, khalaqtani wa ana 'abduk...

“O Allah, You are my Lord; none has the right to be worshipped but You. You created me and I am Your servant, and I abide by Your covenant and promise as best I can...”

— Sahih al-Bukhari 6306