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Abraham figured that if God wanted to, he could raise the dead. In a sense, that's what happened when he received Isaac back, alive from off the altar.
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For he reckoned that God is even able to raise a man up from among the dead, and, figuratively speaking, it was from among the dead that he received Isaac again.
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For he deemed, that God is mighty to raise him, yea, from death [+Deeming, that and from dead God is mighty to raise him]; wherefore he took him also into a parable.