From Sahih Muslim (Hadith 6491):
Umar b. Khattab reported:I heard Allah's Messenger (ﷺ) as saying: Worthy amongst the successors would be a person who would be called Uwais. He would have his mother (living with him) and he would have (a small) sign of leprosy. Ask him to beg pardon for you (from Allah)
Reference: Muslim 6491