Romans 9:7-9

Young's Literal Translation

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;

⁹ for the word of promise [is] this; `According to this time I will come, and there shall be to Sarah a son.'