Musnad Ahmad 1153:1907

Abu Mu'awiyah narrated to us, he said: Al-A'mash narrated to us, from Tamim ibn Salamah, from 'Urwah, from 'Aishah. And he said: Hisham narrated to us, from his father, from 'Aishah, she said: "I used to perform ghusl, I and the Messenger of Allah, may Allah bless him and grant him peace, from a single vessel."