Numbers 26:19-21

The sons of Judah were Er and Onan, but Er and Onan died in the land of Canaan. The sons of Judah according to their families were: of Shelah, the family of the Shelanites; of Perez, the family of the Perezites; of Zerah, the family of the Zerahites. The sons of Perez were: of Hezron, the family of the Hezronites; of Hamul, the family of the Hamulites.