I think this one is normal human speech. Sometimes we round off a number when we talk about how many people there are, without actually mentioning that we’re doing so.
I was surprised at some of the mistakes in the bible when I looked into it once. But none of them are very big, mostly numbers copied incorrectly, and none have doctrinal bearing. After learning that the Quran is supposed to be the direct word of God and many Muslims believe it’s perfectly preserved, I believe the errors in the Bible actually are providential:
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It reminds us that these are human authors and people who copied the writings, so that we consider that in the interpretation. Otherwise perhaps we could argue that these are books that fell directly from heaven, or some such nonsense. That’s not how God wanted us to view them.
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He gets more glory by human hands writing his Word because it appears foolish to others. But when you can see how all the books fit together in a cohesive library, then you can glorify Him even more as such a thing should not be able to happen unless they came from God.