Musnad Ahmad 32:741

'Abd al-Razzaq narrated to us, Ma'mar informed us, and 'Abd al-A'la, from Ma'mar, from al-Zuhri, from Anas ibn Malik, who said: "The Messenger of Allah, may Allah bless him and grant him peace, forbade the *duba'* (gourd) and the *muzaffat* (pitch-coated vessel)."