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You left out verse 9, that they were to have sandals on their feet.
If you will pardon a Lutheran reference, at Historic Trinity Lutheran Church in Detroit there is a chancel artwork with prophets portrayed in one set, and apostles in another set below. The prophets have bare feet, because like Moses the place they stand on is holy ground. The apostles have sandals, because Jesus commanded this in Mark 6:9. An interesting distinction, I think.