Jami` at-Tirmidhi 1893

Narrated Anas bin Malik: "The Messenger of Allah (ﷺ) was brought some milk which was mixed with some water. On his right was a Bedouin and on his left was Abu Bakr. So he drank, then he gave it to the Bedouin and said: 'The right, then the right.'" He said: There are narrations on this topic from Ibn 'Abbas, Sahl bin Sa'd, Ibn 'Umar, and 'Abdullah bin Busr. [Abu 'Eisa said:] This Hadith is Hasan Sahih