Sahih Muslim Book 31, Hadith Number 5932.
Chapter : Merits of Sa’d b. Abi Waqqis (Allah be pleased with him).
‘Amir b. Sa’d reported on the authority of his father that Allah’s Apostle (may peace be upon him) gathered for him on the Day of Uhud his parents when a polytheist had set fire to (i.e. attacked fiercely) the Muslims. Thereupon Allah’s Apostle (may peace be upon him) said to him: (Sa’d), shoot an arrow, (Sa’d), may my mother and father be taken as ransom for you. I drew an arrow and I shot a featherless arrow at him aiming his side that lie fell down and his private parts were exposed. Allah’s Messenger (may peace be upon him) laughed that I saw his front teeth.