Romans 9:6-8

Revised Standard Version Catholic Edition

⁶ But it is not as though the word of God had failed. For not all who are descended from Israel belong to Israel, ⁷ and not all are children of Abraham because they are his descendants; but “Through Isaac shall your descendants be named.” ⁸ This means that it is not the children of the flesh who are the children of God, but the children of the promise are reckoned as descendants.