Sahih Bukhari Volume 3, Book 51, Hadith 2603

حَدَّثَنَا يَحْيَى بْنُ قَزَعَةَ، حَدَّثَنَا مَالِكٌ، عَنْ أَبِي حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم أُتِيَ بِشَرَابٍ فَشَرِبَ، وَعَنْ يَمِينِهِ غُلاَمٌ وَعَنْ يَسَارِهِ الأَشْيَاخُ فَقَالَ لِلْغُلاَمِ ‏"‏ إِنْ أَذِنْتَ لِي أَعْطَيْتُ هَؤُلاَءِ ‏"‏‏.‏ فَقَالَ مَا كُنْتُ لأُوثِرَ بِنَصِيبِي مِنْكَ يَا رَسُولَ اللَّهِ أَحَدًا‏.‏ فَتَلَّهُ فِي يَدِهِ‏.‏

Narrated By Sahl bin Sad : A drink (milk mixed with water) was brought to the Prophet who drank some of it while a boy was sitting on his right and old men on his left. The Prophet said to the boy, "If you permit me, I'll give (the rest of the drink to) these old men first." The boy said, "I will not give preference to any one over me as regards my share from you, O Allah's Apostle!" The Prophet then put that container in the boy's hand.