Sayyid al-istighfar — the master supplication for forgiveness
Allahumma anta Rabbi, la ilaha illa Anta, khalaqtani wa ana 'abduk, wa ana 'ala 'ahdika wa wa'dika ma-stata't, a'udhu bika min sharri ma sana't, abu'u laka bi ni'matika 'alayya, wa abu'u laka bi dhanbi, faghfir li, fa innahu la yaghfiru-dh-dhunuba illa Anta.
O Allah, You are my Lord. There is no god but You. You created me and I am Your servant. I keep Your covenant and Your promise as best I can. I seek refuge in You from the evil of what I have done. I acknowledge Your favour upon me and I acknowledge my sin. So forgive me, for no one forgives sins except You.
The Prophet ﷺ said whoever recites this with conviction in the morning and dies that day before evening is of the people of paradise. Same at evening.

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