Musannaf Ibn Abi Shayba 20:79

Yazid ibn Harun narrated to us, he said: Juwayriyah ibn Asma’ informed us, from Abdullah ibn Yazid, the freed slave of al-Munba’ith, from a man from the people of Egypt, from Saraq, that the Messenger of Allah (may Allah bless him and grant him peace) judged by two witnesses and an oath.