Romans 9:6-8

World English Bible

⁶ But it is not as though the word of God has come to nothing. For they are not all Israel that are of Israel. ⁷ Neither, because they are Abraham’s offspring, are they all children. But, “your offspring will be accounted as from Isaac.”Genesis 21:12 ⁸ That is, it is not the children of the flesh who are children of God, but the children of the promise are counted as heirs.