6-9 Don’t suppose for a moment, though, that God’s Word has malfunctioned in some way or other. The problem goes back a long way. From the outset, not all Israelites of the flesh were Israelites of the spirit. It wasn’t Abraham’s sperm that gave identity here, but God’s promise. Remember how it was put: “Your family will be defined by Isaac”? That means that Israelite identity was never racially determined by sexual transmission, but it was God-determined by promise. Remember that promise, “When I come back next year at this time, Sarah will have a son”?

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Nor because they are his descendants are they all Abraham’s children. On the contrary, “It is through Isaac that your offspring will be reckoned.”[a](A) In other words, it is not the children by physical descent who are God’s children,(B) but it is the children of the promise who are regarded as Abraham’s offspring.(C) For this was how the promise was stated: “At the appointed time I will return, and Sarah will have a son.”[b](D)

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Footnotes

  1. Romans 9:7 Gen. 21:12
  2. Romans 9:9 Gen. 18:10,14