Muwatta Imam Malik Book of The Description of the Prophet ﷺ, Hadith 17

Yahya related to me from Malik from Ibn Shihab from Anas ibn Malik that the Messenger of Allah ﷺ 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 ﷺ أُتِيَ بِلَبَنٍ قَدْ شِيبَ بِمَاءٍ مِنَ الْبِئْرِ وَعَنْ يَمِينِهِ أَعْرَابِيٌّ وَعَنْ يَسَارِهِ أَبُو بَكْرٍ الصِّدِّيقُ فَشَرِبَ ثُمَّ أَعْطَى الأَعْرَابِيَّ وَقَالَ " الأَيْمَنَ فَالأَيْمَنَ " .