Romans 9:6-8
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6But it is not as though the word of God has come to nothing. For they are not all Israel, that are of Israel. 7Neither, because they are Abraham`s seed, are they all children. But, "In Isaac will your seed be called." 8That is, it is not the children of the flesh who are children of God, but the children of the promise are counted as a seed.
Romans 9:6-8 (WEB)