Sayyiduna Ibn Umar and Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) forbade "making nabidh in gourd vessels, vessels made from hollowed tree roots, earthenware jars and pitch-coated vessels."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأشربة والحد فيها / 17468