Romans 9:3-8

ISV(i) 3 for I could wish that I myself were condemned and cut off from the Messiah for the sake of my brothers, my own people, 4 who are Israelis. To them belong the adoption, the glory, the covenants, the giving of the Law, the worship, and the promises. 5 To the Israelis belong the patriarchs, and from them, the Messiah descended, who is God over all, the one who is forever blessed. Amen.
6 Now it is not as though the word of God has failed. For not all Israelis truly belong to Israel, 7 and not all of Abraham’s descendants are his true descendants. On the contrary, “It is through Isaac that descendants will be named for you.” 8 That is, it is not merely the children born through natural descent who were regarded as God’s children, but it is the children born through the promise who were regarded as descendants.