Numbers 26:18-20

Young's Literal Translation

¹⁸ These [are] families of the sons of Gad, by their numbered ones, forty thousand and five hundred.

¹⁹ Sons of Judah [are] Er and Onan; and Er dieth -- Onan also -- in the land of Canaan.

²⁰ And sons of Judah, by their families, are: of Shelah the family of the Shelanite; of Pharez the family of the Pharzite; of Zerah the family of the Zarhite;