Musnad Ahmad 1153:1616

'Abd al-Razzaq narrated to us, Ma'mar and Ibn Jurayj narrated to us, from al-Zuhri, from 'Urwah, from 'A'ishah, who said: "I used to perform ghusl (ritual bath) with the Messenger of Allah, peace and blessings of Allah be upon him, from a single vessel containing the amount of a faraq."