Afterward his brother came forth, and his hand had taken hold of Esau's heel; so his name was called Jacob. Isaac was sixty years old when she bore them.
Of the people of Judah, their generations, by their families, by their fathers' houses, according to the number of names, from twenty years old and upward, every man able to go forth to war:
And he gave him the covenant of circumcision. And so Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac became the father of Jacob, and Jacob of the twelve patriarchs.