WNT(i)
4 To them belongs recognition as God's sons, and they have His glorious Presence and the Covenants, and the giving of the Law, and the Temple service, and the ancient Promises.
5 To them the Patriarchs belong, and from them in respect of His human lineage came the Christ, who is exalted above all, God blessed throughout the Ages. Amen.
6 Not however that God's word has failed; for all who have sprung from Israel do not count as Israel,
7 nor because they are Abraham's true children. But the promise was "THROUGH ISAAC SHALL YOUR POSTERITY BE RECKONED."
8 In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.