Musannaf Ibn Abi Shaybah 40484 — Reports on Uthman (may Allah be)

It is narrated from Sayyiduna Abdullah bin Salam (may Allah be pleased with him) that he said: Do not draw your swords. If you draw your swords, they will not go back into the scabbard until the Day of Resurrection. Then he said: Give me respite of eighteen days, meaning until the day of the martyrdom of Sayyiduna Uthman (may Allah be pleased with him) (because he himself would pass away).