Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Anas bin Malik (Radi-Allahu ‘anhu):

I saw Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam) drinking milk. He came to my house and I milked a sheep and then mixed the milk with water from the well for Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam). He took the bowl and drank while on his left there was sitting Abu Bakr, and on his right there was a bedouin. He then gave the remaining milk to the bedouin and said, “The right! The right (first).”

Bukhari Vol. 7 : No. 516