Sahih Muslim Book 23, Hadith Number 4929.

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

Abu Sa’id Khudri reported that Allah’s Messenger (may peace be upon him) forbade (the preparation) of Nabidh in gourd, in pitcher besmeared with green pitch, in hollow stump and in varnished jar.