Genesis 17:15

Abram and Nahor took wives for themselves. The name of Abram’s wife was Sarai; and the name of Nahor’s wife was Milcah, the daughter of Haran, the father of Milcah and the father of Iscah.

“Listen to Me, you who pursue righteousness, Who seek Yahweh: Look to the rock from which you were hewn And to the quarry from which you were dug.

“For this reason Moses has given you circumcision (not because it is from Moses, but from the fathers), and on the Sabbath you circumcise a man.

“And He gave him the covenant of circumcision; and so Abraham was the father of Isaac, and circumcised him on the eighth day; and Isaac was the father of Jacob, and Jacob of the twelve patriarchs.

Sarah Will Bear Isaac