Musannaf Ibn Abi Shaybah 39868 — Reports on the caliphate and killing

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that one morning Sayyiduna Uthman (may Allah be pleased with him) related to the people, saying: "Last night I saw the Prophet (peace and blessings be upon him) in a dream. He (peace and blessings be upon him) said: 'O Uthman! Break your fast with us.'" Sayyiduna Uthman began the morning fasting and was martyred that same day.