Musnad Abu Ya'la al-Mawsili 118:20

Muhammad ibn 'Abbad al-Makki narrated to us, Sufyan narrated to us, he said: I memorized from al-Zuhri, from the beginning to the end, that he heard Anas saying: The Messenger of Allah (may Allah bless him and grant him peace) entered our house, so we milked for him from a domestic sheep, and it was mixed for him with water from a well in the house. The Messenger of Allah (may Allah bless him and grant him peace) drank, while Abu Bakr was to his left, a Bedouin was to his right, and 'Umar was to the side. 'Umar said: "Give it to Abu Bakr." But the Messenger of Allah (may Allah bless him and grant him peace) handed it to the Bedouin and said: "The one on the right, then the one on the right."