Mishkat al-Masabih #4101

Sahl b. Sa'd told that the Prophet was brought a cup from which he drank, and on his right was a youth who was the youngest present, while the old men were on his left. He asked the youth to permit him to give it to the old men, but he replied, “I am not one to give anyone preference in a favour from you, messenger of God.” So he gave it to him. (Bukhari and Muslim.)