Genesis 46:12, 26-27

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

All those who went to Egypt with Jacob—those who were his direct descendants, not counting his sons’ wives—numbered sixty-six persons. With the two sons who had been born to Joseph in Egypt, the members of Jacob’s family, which went to Egypt, were seventy in all.