Musannaf Ibn Abi Shayba 3:3720

Abu Bakr narrated to us, he said: Abd al-Wahhab al-Thaqafi narrated to us, from Yahya ibn Sa'id, he said: It reached me that Umar ibn Abd al-Aziz said to a man who was leading a people in prayer in al-Aqiq, whose lineage was not known: He forbade him from leading them in prayer.