Romans 9:6-8
6But [it is] not as though the word of God hath come to nought. For they are not all Israel, that are of Israel:d
7neither, because they are Abraham’s seed, are they all children: but, In Isaac shall thy seed be called.e
8That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.f