Genesis 46:12, 26-27

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

All the persons belonging to Jacob who came into Egypt, who were his own descendants, not including Jacob’s sons’ wives, were sixty-six persons in all. And the sons of Joseph, who were born to him in Egypt, were two. All the persons of the house of Jacob who came into Egypt were seventy.