Romans 9:8

So the children born in the natural way are not God's children. It is the children of the promise who are counted as Abraham's children.

Romans 9:8, Readable English Bible (READ)

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Previous · Romans 9:7And not all of Abraham's descendants are his true children. Instead, God said, "Your children will be counted through Isaac." Next · Romans 9:9This is what God promised: "At the set time I will come back. And Sarah will have a son."