It was narrated that Ka'b bin 'Ujrah said: "The Messenger of Allah mentioned a Fitnah (tribulation) that had drawn nigh. Then a man passed by with his head covered. The Messenger of Allah said: “On that day, this man will be following right guidance.' I leapt up and took hold of 'Uthman's arms, then I turned to face the Messenger of Allah and said: “This man?' He said: “This man”””"
SahihSahihSahihBook 0 · Hadith 111