Musnad Ahmad 1153:1591

Husayn ibn Muhammad narrated to us, he said: Jarir—meaning Ibn Hazim—narrated to us, from Hisham ibn Urwah, from his father, from Aisha, who said: "I and the Messenger of Allah, may Allah bless him and grant him peace, used to perform ghusl (ritual bathing) from a single vessel." And I would say, "Leave some for me, leave some for me." That is what he said.