Musnad Abu Ya'la al-Mawsili 209:54

Uqbah ibn Mukram narrated to us, Yunus ibn Bukayr narrated to us, Talhah ibn Yahya narrated to us, from Umm Kulthum bint Abdullah ibn Zam'ah, that her grandmother, Umm Salamah, the wife of the Prophet (may Allah bless him and grant him peace), handed her a basin made of brass. She said: "The Messenger of Allah (may Allah bless him and grant him peace) used to perform ghusl (ritual washing) in this." Talhah said: "Umm Kulthum showed it to me; it was about the size of a sa' or slightly larger."