A tumbler (full of milk or water) was brought to the Prophet ﷺ who drank from it, while on his right side there was sitting a boy who was the youngest of those who were present and on his left side there were old men. The Prophet ﷺ asked, "O boy, will you allow me to give it (i.e. the rest of the drink) to the old men?" The boy said, "O Messenger of Allah ﷺ! I will not give preference to anyone over me to drink the rest of it from which you have drunk." So, the Prophet ﷺ gave it to him.  

أُتِيَ النَّبِيُّ ﷺ بِقَدَحٍ فَشَرِبَ مِنْهُ وَعَنْ يَمِينِهِ غُلاَمٌ أَصْغَرُ الْقَوْمِ وَالأَشْيَاخُ عَنْ يَسَارِهِ فَقَالَ يَا غُلاَمُ أَتَأْذَنُ لِي أَنْ أُعْطِيَهُ الأَشْيَاخَ قَالَ مَا كُنْتُ لأُوثِرَ بِفَضْلِي مِنْكَ أَحَدًا يَا رَسُولَ اللَّهِ فَأَعْطَاهُ إِيَّاهُ  

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