Sahih Muslim Book 23, Hadith Number 4916.
Chapter : It is forbidden to prepare Nabidh is varnished jar, gourd, green pitcher, and hollow stumps.
Abu Huraira reported that Allah’s Apostle (may peace be upon him) said to the group of Abd al-Qais: I forbid you (to prepare Nabidh) in gourd and green pitcher, hollow stump and varnished jar and the water-skin having its upper end cut, but (prepare it) in your small water-skin, and tie its mouth