Romans 9:7-9

BBE(i) 7 And they are not all children because they are the seed of Abraham; but, In Isaac will your seed be named. 8 That is, it is not the children of the flesh, but the children of God's undertaking, who are named as the seed. 9 For this is the word of God's undertaking, At this time will I come, and Sarah will have a son.