Musannaf Ibn Abi Shayba 17:1357

26659. Isma'il ibn 'Ayyash narrated to us, from Hisham ibn 'Urwah, who said: My father said to me, "Did you write [it] down?" I said, "Yes." He said, "Did you compare [it]?" I said, "No." He said, "You did not write [it] down."