Musnad Ahmad 1153:993

Sulayman ibn Dawud al-Hashimi narrated to us, he said: Abu Zubayd informed us, from al-A'mash, from Ibrahim, from al-Aswad, from Aisha, she said: "The Prophet, peace and blessings of Allah be upon him, forbade the *duba* (gourd) and the *muzaffat* (pitch-coated vessel)."