Musnad Ahmad 1153:706

Abu Sa’id and ‘Abd al-Samad narrated to us, they said: Thabit Abu Zayd narrated to us, he said: ‘Asim narrated to us, from Mu’adhah. Abu Sa’id said: ‘A’ishah narrated to her, she said: "I used to perform ghusl (ritual bath) with the Prophet, may Allah bless him and grant him peace, from a single vessel, and I would race him, and I would say: 'Leave some for me, leave some for me.'"