Exodus 25:11

11You are to overlay
The verbs throughout here are perfect tenses with the vav (ו) consecutives. They are equal to the imperfect tense of instruction and/or injunction.
it with pure gold – both inside and outside you must overlay it,
Here the verb is an imperfect tense; for the perfect sequence to work the verb would have to be at the front of the clause.
and you are to make a surrounding border
The word זֵר (zer) is used only in Exodus and seems to describe something on the order of a crown molding, an ornamental border running at the top of the chest on all four sides. There is no indication of its appearance or function.
of gold over it.
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