Answered by Shaykh Faraz Rabbani
I read this dua after attahiyatu and dorud in my prayer but I don’t think I pronounce it properly…my parents taught it to me and I never saw the Arabic: allahumma inna zalamtu nafsi zulman kakirao wala yag firuzuluma illa anta fag firli mag firatam indika warhamni innaka antal gafururraheem
Walaikum assalam wa rahmatullah,
The Arabic text is: [ a reading of it is attached]
It is a hadith related by Bukhari, Muslim, and others, in which the Messenger of Allah (Allah bless him and give him peace) taught Abu Bakr (Allah be pleased with him) a supplication to say at the end of his prayer, namely:
O Allah, I have wronged myself a great wronging, and none but you forgives sins. So forgive me with forgiveness from You, and grant me mercy, for You are the Forgiving and Merciful.’
Note that it is a confirmed sunna to make dua before the final salams in prayer. Any dua for non-worldly matters will fulfill this sunna, [ Maraqi al-Falah, Durr al-Mukhtar] but it is best to try to make a heart-felt dua using the duas of the Beloved of Allah (Allah bless him and give him peace), for the words of the beloved are beloved to the Beloved.
And Allah alone gives success.
Wassalam,
Faraz Rabbani