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About the most holy things - Omit “about.” The sense is, “this is the charge of the sons of Kohath, the most holy things:” that is, the ark …

This shall be the service of the sons of Kohath in the tabernacle of the congregation, about the most holy things:
They were to atte…

This shall be the service of the sons of Kohath. He assigns their various offices to the Levites for these reasons:

This [shall be] the service of the sons of Kohath, in the
tabernacle of the congregation

The Kohathites were to carry the holy things of the tabernacle. All the holy things were to be covered; not only for security and respect, but to k…
Albert Barnes
AlbertBarnes