Romans 9:8-10

Amplified Bible, Classic Edition

⁸ That is to say, it is not the children of the body [of Abraham] who are made God’s children, but it is the offspring to whom the promise applies that shall be counted [as Abraham’s true] descendants.

⁹ For this is what the promise said, About this time [next year] will I return and Sarah shall have a son.^(A)

¹⁰ And not only that, but this too: Rebecca conceived [two sons under exactly the same circumstances] by our forefather Isaac,