Sahih al-Bukhari Book 74, Hadith 45
Milk mixed with water was brought to Allah's Messenger (ﷺ) while a bedouin was on his right and Abu Bakr
was on his left. He drank (of it) and then gave (it) to the bedouin and said, 'The right" "The right
(first).
(daughter of Al-Harith) that she sent a bowl of milk to the Prophet (ﷺ) while he was standing (at `Arafat) in the afternoon of the Day of `Arafat. He took it in his hands and drank it. Narrated Abu Nadr: The Prophet was on the back of his camel.
Allah's Messenger (ﷺ) was offered something to drink. He drank of it while on his right was a boy and on his left were some elderly people. He said to the boy, "May I give these (elderly) people first?" The boy said, "By Allah, O Allah's Messenger (ﷺ)! I will not give up my share from you to somebody else." On that Allah's Messenger (ﷺ) placed the cup in the hand of that boy.