Abu Ashath reported,

Some speakers stood to address the people in Iliya during the rule of Muawiya, may Allah be pleased with him, and they spoke. The last to speak was Mura bin Kaab, who said, "Were it not for a hadith I heard from the Messenger of Allah ﷺ, I would not have stood up. I heard the Messenger of Allah ﷺ mention a tribulation and describe it as drawing near, when a man passed by with his head covered. The Prophet ﷺ said, 'This man and his companions will be upon the truth and guidance on that day.'I asked, 'This one, Messenger of Allah?' and I turned the man's face toward him.He replied, 'This one.'And it turned out to be Uthman ."

حدثنا محمد بن بكر يعني البرساني أخبرنا وهيب بن خالد حدثنا أيوب عن أبي قلابة

عن أبي الأشعث قال

قامت خطباء بإيلياء في إمارة معاوية رضي الله تعالى عنه فتكلموا وكان آخر من تكلم مرة بن كعب فقال لولا حديث سمعته من رسول الله ﷺ ما قمت سمعت رسول الله ﷺ يذكر فتنة فقربها فمر رجل مقنع فقال هذا يومئذ وأصحابه على الحق والهدى فقلت هذا يا رسول الله وأقبلت بوجهه إليه فقال هذا فإذا هو عثمان رضي الله عنه