So my sense is that Paul here sees Genesis 22 as an oblique forward pointer to the fulfilment of the Abrahamic covenant in the death and resurrection of God’s beloved son, not least in order to tie together the exposition of God’s covenant faithfulness in chapters 1—4 with the exposition of the consequent security of God’s covenant family in chapters 5—8. The second half of verse 32 then makes more sense than we might have initially realized. A traditional western reading might have expected Paul to say that God, having not spared his own son but having given him up for us all, would then save
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