The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1940
'A'isha reported that Abu Bakr came to her and there were with her two girls on Adha days who were singing and beating the tambourine and the Messenger of Allah (may peace be upon him) had wrapped himself with his mantle. Abu Bakr scolded them. The Messenger of Allah (may peace he upon him) uncovered (his face) and said: Abu Bakr, leave them alone for these are the days of 'Id. And 'A'isha said: I recapitulate to my mind the fact that once the Messenger of Allah (may peace be upon him) screened me with his mantle and I saw the sports of the Abyssinians, and I was only a girl, and so you can well imagine how a girl of tender age is fond of watching the sport.