Abdullah bin Yazid, the freed slave of al-Munba'ith, narrates from an Egyptian man, and he from one of the Companions of the Prophet (peace and blessings be upon him) who lived among them, who was called Surraq (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) "judged by an oath and a witness."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20671