The Book of Faith
Ṣaḥīḥ Muslim 214
Say this
رَبِّ اغْفِرْ لِي خَطِيئَتِي يَوْمَ الدِّينِ
rabbi āghfir lī khaṭīʾatī yawma ad-dīni
Transliteration generated from the Arabic vowel marks
The full narration
A'isha reported:I said: Messenger of Allah, the son of Jud'an established ties of relationship, fed the poor. Would that be of any avail to him? He said: It would be of no avail to him as he did not ever say: O my Lord, pardon my sins on the Day of Resurrection
Source
Ṣaḥīḥ Muslim · 214
Ṣaḥīḥ
- Recorded in Ṣaḥīḥ Muslim, whose narrations are accepted as authentic