Musnad Ahmad 1153:40

Muhammad ibn Ja'far narrated to us, he said: Ma'mar narrated to us, he said: Ibn Shihab informed us, from 'Urwah, from 'Aishah, that Abu Bakr entered upon her while there were two young girls with her beating a tambourine. Abu Bakr rebuked them, so the Prophet, peace and blessings of Allah be upon him, said to him: "Leave them, for every people have an Eid."