Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) said: A cup was brought to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) drank from it. On his (peace and blessings be upon him) right was a boy, the youngest of the people, and on his left were the elders. He (peace and blessings be upon him) said: "O boy, will you permit me to give it to the elders?" He said: O Messenger of Allah, I will not prefer anyone over myself in what is left over from you (as a blessing). So he (peace and blessings be upon him) gave it to him.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5759