Romans 9:8-10

New International Reader's Version

⁸ In other words, God’s children are not just in the family line of Abraham. Instead, they are the children God promised to him. They are the ones considered to be Abraham’s children. ⁹ God promised, “I will return at the appointed time. Sarah will have a son.” (Genesis 18:10,14)

¹⁰ And that’s not all. Rebekah’s children were born at the same time by the same father. He was our father Isaac.