The nachash was cursed to crawl on its belly, imagery that conveyed being cast down (Ezek 28:8, 17; Isa 14:11–12, 15) to the ground. In Ezekiel 28 and Isaiah 14, we saw the villain cast down to the ʾerets, a term that refers literally to the dirt and metaphorically to the underworld (Ezek 28:17; Isa 14:9, 11–12, 15). The curse also had him “eating dirt,” clearly a metaphorical reference, since snakes don’t really eat dirt as food for nutrition. It isn’t part of the “natural snake diet.” The point being made by the curse is that the nachash, who wanted to be “most high,” will be “most low”
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