Musannaf Ibn Abi Shayba 37:421

'Abdullah ibn Idris narrated to us, from his father, from his grandfather, from Ibn 'Umar, who said: I met Ibn Sayyad on one of the paths of Medina, and he swelled up until he filled the earth. I said: "Be driven away (khsa'), for you will never exceed your measure." Then he contracted, part of him into another, and I passed by.