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." (Using translation from Bukhārī 2352)   

أَنَّهُ حُلِبَ لِرَسُولِ اللهِ ﷺ شَاةٌ دَاجِنٌ وَهِيَ فِي دَارِ أَنَسٍ وَشِيبَ لَبَنُهَا بِمَاءِ الْبِئْرِ وَأعْطَى رَسُولَ اللهِ ﷺ الْقَدَحَ فَشَرِبَ مِنْهُ حَتَّى إِذَا نَزَعَ الْقَدَحَ مِنْ فِيهِ وَعَلَى يَسَارِهِ أَبُو بَكْرٍ وَعَلَى يَمِينِهِ أَعْرَابِيٌّ قَالَ عُمَرُ وَخَافَ أَنْ يُعْطِيَ الْأَعْرَابِيَّ أَعْطِ أَبَا بَكْرٍ عِنْدَكَ يَا رَسُولَ اللهِ فَأَعْطَاهُ رَسُولُ اللهِ ﷺ الْأَعْرَابِيَّ عَلَى يَمِينِهِ وَقَالَ رَسُولُ اللهِ ﷺ «الْأَيْمَنَ فَالْأَيْمَنَ»