Romans 9:8 YLT

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;

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

¹⁰  And not only 'so', but also Rebecca, having conceived by one -- Isaac our father --