Muwatta Malik, Book 49, Hadith 1690 (In-Book) ⓘ

Yahya related to me from Malik from Ibn Shihab from Anas ibn Malik that the Messenger of Allah, may Allah bless him and grant him peace, was brought some milk which was mixed with well-water. There was a Bedouin at his right side and Abu Bakr as-Siddiq on his left. He drank and then gave it to the Bedouin and said, "The right-hand to the right-hand."

حَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أُتِيَ بِلَبَنٍ قَدْ شِيبَ بِمَاءٍ مِنَ الْبِئْرِ وَعَنْ يَمِينِهِ أَعْرَابِيٌّ وَعَنْ يَسَارِهِ أَبُو بَكْرٍ الصِّدِّيقُ فَشَرِبَ ثُمَّ أَعْطَى الأَعْرَابِيَّ وَقَالَ ‏ "‏ الأَيْمَنَ فَالأَيْمَنَ ‏" ‏ ‏.‏