Romans 9:6-8

Young's Literal Translation

⁶ And it is not possible that the word of God hath failed; for not all who [are] of Israel are these Israel;

⁷ nor because they are seed of Abraham [are] all children, but -- `in Isaac shall a seed be called to thee;'

⁸ that is, the children of the flesh -- these [are] not children of God; but the children of the promise are reckoned for seed;