Romans 9:7

9:6 But it is not that the word of God has taken no effect. For they are not all Israel who are of Israel,

9:7 nor are they all children because they are the seed of Abraham; but, "In Isaac your seed shall be called."

9:8 That is, those who are the children of the flesh, these are not the children of God; but the children of the promise are counted as the seed.