اللهم أنت ربي لا إله إلا أنت، خلقتني وأنا عبدك، وأنا على عهدك ووعدك ما استطعت، أعوذ بك من شر ما صنعت، أبوء لك بنعمتك علي، وأبوء بذنبي فاغفر لي، فإنه لا يغفر الذنوب إلا أنت
Allahumma anta Rabbi, la ilaha illa ant, khalaqtani wa ana ‘abduk, wa ana ‘ala ‘ahdika wa wa’dika mastata’t, a’udhu bika min sharri ma sana’t, abu’u laka bi ni’matika ‘alayy, wa abu’u bi dhanbi faghfir li, fa innahu la yaghfirudh-dhunuba illa ant
O Allah, You are my Lord; there is no god but You. You created me and I am Your servant, and I keep Your covenant and 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 none forgives sins but You.
Source: Sahih al-Bukhari 6306 — the Prophet ﷺ called it the master of seeking forgiveness
