Sahih Muslim Book 23, Hadith Number 4943.

Chapter : It is forbidden to prepare Nabidh is varnished jar, gourd, green pitcher, and hollow stumps.

‘Uqba b. Huraith said: I heard Ibn ‘Umar saying: The Messenger of Allah (may peace be upon him) forbade (the preparation of Nabidh) in a green pitcher (besmeared with pitch), in varnished jar, and in gourd, and he said: Prepare Nabidh in small water-skins.