Romans 9:6-8

New Revised Standard Version Catholic Edition

⁶ It is not as though the word of God had failed. For not all Israelites truly belong to Israel, ⁷ and not all of Abraham’s children are his true descendants; but “It is through Isaac that descendants shall be named for you.” 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 counted as descendants.