Musnad Abu Ya'la al-Mawsili 148:105

Abu al-Rabi' al-Zahrani narrated to us, Hammad narrated to us, from al-Ja'd Abu 'Uthman, who said: Anas ibn Malik passed by us in the mosque of Banu Tha'labah and said, "Have you prayed?" We said, "Yes," and that was the morning prayer. So he ordered a man, and he gave the adhan and the iqamah, then he prayed with his companions.