The Prophet ﷺ was brought milk that had been mixed with water. To his right was a Bedouin, and to his left was Abu Bakr. He drank, then gave it to the Bedouin and said, "The one on the right, then the next on the right."
حدثنا القعنبي عبد الله بن مسلمة عن مالك عن ابن شهاب
أن النبي ﷺ أتي بلبن قد شيب بماء وعن يمينه أعرابي وعن يساره أبو بكر فشرب ثم أعطى الأعرابي وقال الأيمن فالأيمن
Bukhari narrated it in the Book of Drinks, Chapter on the one to the right, then the next to the right, when drinking, hadith no. 5619, and Muslim in the Book of Drinks, Chapter on the recommendation of passing water, milk, and similar drinks to the one on the right of the one who begins, hadith no. 2029, from the hadith of Malik through the same chain, and it is found in Muwatta (Yahya) 2/926.