Musannaf Ibn Abi Shaybah 39866 — Reports on the caliphate and killing

It is narrated from Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him), who said: On the day of the siege I said to Sayyiduna Uthman (may Allah be pleased with him): "Come out and fight these people, for with you (today) are (as many) people as a smaller number than whom Allah has helped. By Allah, fighting these people is lawful." The narrator said: Sayyiduna Uthman refused and ordered: "Whoever considers listening to me and obeying me binding upon himself should obey Abdullah bin al-Zubayr." On that day (of the siege), Sayyiduna Uthman had appointed him as commander in the house, and on that day (of the siege) Sayyiduna Uthman was fasting.