12 and they shall take all the utensils of service , with which they serve in the sanctuary , and put them in a blue cloth and cover them with a covering of porpoise skin , and put them on the carrying bars .

Matthew Henry's Commentary on Numbers 4:12

Commentary on Numbers 4:4-20

(Read Numbers 4:4-20)

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 keep them from being seen. This not only marked the reverence due to holy things, but the mystery of the things signified by those types, and the darkness of the dispensation. But now, through Christ, the case is altered, and we are encouraged to come boldly to the throne of grace.