Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) said: I was with the Prophet (peace and blessings be upon him) when he mentioned a tribulation and said it was near. Just then a man with his face covered passed by, and he (peace and blessings be upon him) said: "This man will be upon the truth on that day." I got up and went to him, took hold of his upper arms and turned his face towards the Messenger of Allah (peace and blessings be upon him), and said: O Messenger of Allah, is it this man? He (peace and blessings be upon him) said: "Yes." And it was Sayyiduna Uthman bin Affan (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16408