Romans 9:7-9

ASV(i) 7 neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called. 8 That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed. 9 For this is a word of promise, According to this season will I come, and Sarah shall have a son.