Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) said: I was sitting with the Messenger of Allah (peace and blessings be upon him) while he was telling us about the tribulations, when a man with his face covered passed by, and he (peace and blessings be upon him) said: "This man and his companions will be upon guidance on that day." I stood up, caught up with him and removed the covering from his head, and saw that it was Sayyiduna Uthman bin Affan (may Allah be pleased with him). I said: O Messenger of Allah, is it this man? He (peace and blessings be upon him) said: "Yes."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16411