Sahih Muslim Book 23, Hadith Number 4917.

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

‘Ali reported that Allah’s Messenger (may peace be upon him) forbade to prepare Nabidh in gourd and varnished jar. This hadith has been narrated through another chain of transmitters with a slight variation of wording.