Romans 9:3-8

for my people, my Jewish brothers and sisters. I would be willing to be forever cursed—cut off from Christ!—if that would save them. They are the people of Israel, chosen to be God’s adopted children. God revealed his glory to them. He made covenants with them and gave them his law. He gave them the privilege of worshiping him and receiving his wonderful promises. Abraham, Isaac, and Jacob are their ancestors, and Christ himself was an Israelite as far as his human nature is concerned. And he is God, the one who rules over everything and is worthy of eternal praise! Amen. Well then, has God failed to fulfill his promise to Israel? No, for not all who are born into the nation of Israel are truly members of God’s people! Being descendants of Abraham doesn’t make them truly Abraham’s children. For the Scriptures say, “Isaac is the son through whom your descendants will be counted,” though Abraham had other children, too. This means that Abraham’s physical descendants are not necessarily children of God. Only the children of the promise are considered to be Abraham’s children.