Genesis 46:12, 26-27

The sons of Judah were Er, Onan, Shelah, Perez, and Zerah (but Er and Onan died in the land of Canaan). The sons of Perez were Hezron and Hamul.

All the persons who went with Jacob to Egypt, who came from his body, besides Jacob’s sons’ wives, were sixty-six persons in all. And the sons of Joseph who were born to him in Egypt were two persons. All the persons of the house of Jacob who went to Egypt were seventy.