Hebrews 11:18

and had been told that it is through Isaac that your offspring shall be reckoned ??19 for he considered that God was able even to raise men from the dead. Hence he did get him back, by what was a parable of the resurrection.

Romans 9:7

they are not all children of Abraham because they are descended from Abraham. No, it is through Isaac that your offspring shall be reckoned ??8 meaning that instead of God's children being the children born to him by natural descent, it is the children of the Promise who are reckoned as his true offspring.

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