Genesis 46:12, 26-27

The sons of Judah: Er and Onan and Shelah and 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 to Egypt, his direct descendants, not including the wives of Jacob’s sons, 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 to Egypt, were seventy.