Musannaf Ibn Abi Shayba 13:3064

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Hasan ibn Salih narrated to us, from al-Ja’d ibn Dhakwan, he said: A man came forward to Shurayh. He said: So he called for a witness of his. He said: "Where is Rabi’ah al-Kuwayfir?" So he came. Shurayh said: "Have you confessed to your disbelief (kufr)?" Then he rejected his testimony.