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Forgiveness

Sayyid al-Istighfar

اللَّهُمَّ أَنْتَ رَبِّي لَا إِلَٰهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ

Allahumma anta rabbi la ilaha illa ant, khalaqtani wa ana ‘abduk

O Allah, You are my Lord, there is no deity but You. You created me and I am Your servant.

Source
Sahih al-Bukhari
When it is said
Called the best manner of seeking forgiveness. Said morning and evening.

Other duas for forgiveness