Murra b. Ka'b said:
I heard God's messenger when he mentioned the civil wars and their nearness; and when a man who was veiled by a garment passed by, he said, "On that day this man will be rightly guided." I got up and went to him and found he was `Uthman b. `Affan, then making him face the Prophet I asked if this was the man, and he replied, "Yes."
Tirmidhi and Ibn Majah transmitted it, Tirmidhi saying this is a hasan sahih tradition.