Musnad Ahmad 1153:1259

Marwan ibn Mu'awiyah al-Fazari narrated to us, 'Asim narrated to us, from Mu'adhah al-'Adawiyyah, 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, and it was between us."