Since the time of these mighty patriarchs, all of the chosen people of the Lord have come through their lineage or have been adopted into their lineage. In the Old Testament, Jehovah is repeatedly called the God of Abraham, Isaac, and Jacob.

Jacob, in Genesis, identifies Yahweh as the God of his fathers Abraham and Isaac. Secondly, the Bible rejects the claim that God gave Ishmael revelation and prophethood since it expressly says that Ishmael was not included in God’s covenant blessings that were given solely to Isaac, Jacob and his children.

And God said, Sarah your wife shall bear you a son indeed; and you shall call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
But my covenant will I establish with Isaac, which Sarah shall bear unto you at this set time in the next year. Gen. 17:19, 21

In the Abrahamic Covenant, the Lord repeated the covenant promise to three generations, Abraham, Isaac, and Jacob. All three were promised land, many descendants, and a blessing from the Lord. Abraham was called out of Ur of the Chaldees to Canaan, and the Lord established a covenant with Him (Genesis 12:1-3). The Lord reaffirmed the same covenant He made with Abraham’s son, Isaac (Genesis 21:12; 26:3-4). Later, the covenant was affirmed with Isaac’s son, Jacob (Genesis 28:14-15).