Musannaf Ibn Abi Shayba 3:438

Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Tamimah, the freedwoman of Wada'ah, who said: Shurayh entered upon Abu Maysarah to visit him, and he said to him: "How do you pray?" He said: "Sitting." He said: So Shurayh said to him: "You are more knowledgeable than us."