It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that he said: On the day of Uhud I was presented before the Prophet (peace and blessings be upon him) when I was thirteen years old. My father took hold of my hand and began saying: "O Messenger of Allah, he is strong-boned, even though he still looks frail." He (peace and blessings be upon him) looked me over carefully from top to bottom and then said: "Send him back." So he sent me back.