Musannaf Ibn Abi Shayba 13:3085

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Abu al-Husayn, he said: Shurayh used to send the false witness to the mosque of his people or to their marketplace and say: "We have indeed exposed the falsity of this person's testimony."