Genesis 46:12
And the sons of Judah; Er, and Onan, and Shelah, and Pharez, and Zerah: but Er and Onan died in the land of Canaan. And the sons of Pharez were Hezron and Hamul.
Numbers 26:19
The sons of Judah were Er and Onan: and Er and Onan died in the land of Canaan.