Musannaf Ibn Abi Shayba 13:1777

Abu Bakr narrated to us, he said: Ibn Mahdi narrated to us, from Sufyan, from Usama bin Zayd, he said: I asked Sulayman bin Yasar about it, and he said the like of that. So I said to him: "Indeed, he is young." He said: "The Sunnah."