Romans 9:7-9

Noyes(i) 7 nor because they are descendants of Abraham are they all children; but, "Thy offspring shall be reckoned from Isaac." 8 That is, not the children by natural descent are children of God, but the children to whom the promise is made are accounted as the offspring. 9 For the word of promise is this: "At this time I will come, and Sarah shall have a son."