Musnad Abu Ya'la al-Mawsili 1:101

Zuhayr narrated to us, Mu‘alla ibn Mansur narrated to us, Ibn Abi Za’idah narrated to us, Ibn Abi Layla narrated to us, ‘Abd al-Rahman ibn al-Asbahani narrated to us, from ‘Abd al-Rahman ibn Abi Layla, from Abu Bakr al-Siddiq, who said: The Prophet (ﷺ) descended at a place, and a woman sent to him, along with her son, a sheep. He milked it, then said, "Go with it to your mother." She drank until she was satisfied. Then he came with another sheep and milked it, then gave Abu Bakr to drink. Then he came with another sheep and milked it, then he drank.