Musannaf Ibn Abi Shayba 33:285

Abu Mu'awiyah narrated to us, he said: Abu Hayyan narrated to us, from Mujammi', from Ibrahim al-Taymi, from Yazid ibn Sharik, who said: Ali went out one day with his sword and said: "Who will buy this sword of mine from me? For if I had the price of an izar (waist-wrapper), I would not have sold it."