Maliks Muwatta Book 42, Hadith Number 6.
Section : Containers Forbidden for Preparation of Nabidh.
Yahya related to me from Malik from al-Ala ibn Abd ar-Rahman ibn Yaqub from his father from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, forbade preparing nabidh in a gourd or in a jug smeared with pitch.