Imam Malik's Muwatta, Chapter: The Description of the Prophet, may Allah Bless Him and Grant Him Peace

Yahya related to me from Malik from Abu Hazim ibn Dinar from Sahl ibn Sad al-Ansari that the Messenger of Allah, may Allah bless him and grant him peace, was brought a drink and he drank some of it. There was a boy at his right and some old men on his left. He said to the boy, "Will you give me permission to give it to these people?" The boy said, "No, Messenger of Allah, I will not prefer anyone to get my portion from you." He said, "So the Messenger of Allah, may Allah bless him and grant him peace, placed it in his hand."