They, plus a handful of others (which equally imply both flatness and immobility) are the only references of any kind to the shape or form of the earth in the bible. I think it's entirely fair to say that to the degree the bible describes the shape of the earth, it does not describe a sphere.
Fair enough, just seems fairly irrelevant in the scheme of things.
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It's an allegory for baptism, for death/rebirth through later Christian baptism. I mean really, I wouldn't come in here and criticize the theory of general relativity unless I'd at least learned the basics of it first.