Abu al-Zinad (may Allah have mercy on him) said that Umar bin Abd al-Aziz (may Allah have mercy on him) wrote to Abd al-Hamid bin Abd al-Rahman (may Allah have mercy on him), who was the governor of Kufah: Judge by an oath and a witness, for this is the Sunnah. Abu al-Zinad (may Allah have mercy on him) said: A man from among their elders stood up and said: Qadi Shurayh (may Allah have mercy on him) gave judgement in this way in this very mosque.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20679