Hadith in Omer Suleiman Talk

In this talk (around 30:00 or so) Omer Suleiman talks about a hadith (possibly paraphrasing) that in the Day of Judgment, and for certain people, Allah will show them their sins and turn them into good deeds, and the person will be so surprised that he will look for sins that the angel might have skipped. Can someone point me to the source of this hadith or narration?