Musannaf Ibn Abi Shaybah

Hazrat Abu Qalabah (may Allah have mercy on him) narrates that when Hazrat Uthman (may Allah be pleased with him) was martyred, many speakers addressed the people at the place of Ilya. Then, at the end, a companion of the Prophet (peace and blessings be upon him), whose name was Ka'b bin Murrah (may Allah be pleased with him), stood up and said: If I had not heard this hadith myself from the Messenger of Allah (peace and blessings be upon him), I would never have stood up. The Messenger of Allah (peace and blessings be upon him) mentioned the trial (fitnah). I think he described it as being very near, when a man whose head was covered with a cloth passed by. The Messenger of Allah (peace and blessings be upon him) said: On that day, this man and his group will be upon the truth. So I followed that man, then I caught him by the shoulders and turned his face towards the Messenger of Allah (peace and blessings be upon him) and asked: This man? He (peace and blessings be upon him) said: Yes. So that was Hazrat Uthman (may Allah be pleased with him).