Anas bin Malik said, that once a domestic sheep was milked for Messenger of Allah ﷺ while he was in the house of Anas bin Malik. The milk was mixed with water drawn from the well in Anas's house. A tumbler of it was presented to Messenger of Allah ﷺ who drank from it. Then Abu Bakr was sitting on his left side and a bedouin on his right side. When the Prophet ﷺ removed the tumbler from his mouth, ʿUmar was afraid that the Prophet ﷺ might give it to the bedouin, so he said. "O Messenger of Allah ﷺ! Give it to Abu Bakr who is sitting by your side." But the Prophet ﷺ gave it to the bedouin, who was to his right and said, "You should start with the one on your right side."  

أَنَّهَا حُلِبَتْ لِرَسُولِ اللَّهِ ﷺ شَاةٌ دَاجِنٌ وَهْىَ فِي دَارِ أَنَسِ بْنِ مَالِكٍ وَشِيبَ لَبَنُهَا بِمَاءٍ مِنَ الْبِئْرِ الَّتِي فِي دَارِ أَنَسٍ فَأَعْطَى رَسُولَ اللَّهِ ﷺ الْقَدَحَ فَشَرِبَ مِنْهُ حَتَّى إِذَا نَزَعَ الْقَدَحَ مِنْ فِيهِ وَعَلَى يَسَارِهِ أَبُو بَكْرٍ وَعَنْ يَمِينِهِ أَعْرَابِيٌّ فَقَالَ عُمَرُ وَخَافَ أَنْ يُعْطِيَهُ الأَعْرَابِيَّ أَعْطِ أَبَا بَكْرٍ يَا رَسُولَ اللَّهِ عِنْدَكَ فَأَعْطَاهُ الأَعْرَابِيَّ الَّذِي عَلَى يَمِينِهِ ثُمَّ قَالَ الأَيْمَنَ فَالأَيْمَنَ  

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."  

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