And God gave Abraham a covenant [a formal agreement to be strictly observed] of [which] circumcision [was the sign]; and so [under these circumstances] Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac [became the father] of Jacob, and Jacob [became the father] of the twelve patriarchs.

The sons of isaac

When her days to be delivered were fulfilled, behold, there were twins in her womb.

“I have loved you,” says the Lord. But you say, “How and in what way have You loved us?” “Was not Esau Jacob’s brother?” declares the Lord. “Yet I loved Jacob (Israel);

And not only that, but this too: Rebekah conceived twin sons by one man [under the same circumstances], by our father Isaac;

Israel

And He said, “Your name shall no longer be Jacob, but Israel; for you have struggled with God and with men and have prevailed.”