Aaron and his sons must wear them whenever they enter the Tent of Meeting or approach the altar to minister in the Holy Place, so that they will not incur guilt and die. This is to be a permanent statute for Aaron and his descendants.
We have here, 1. Particular orders about the vestments of the inferior priests. They were to have coats, and girdles, and bonnets, of the same materials with those of the high priest; but there was a difference in shape between their bonnets and his mitre.
Commenting on Exodus 28:40-43
And they shall be upon Aaron, and upon his sons, when they come in unto the tabernacle of the congregation, or when they come near unto the altar to minister in the holy [place]; that they bear not iniquity, and die: [it shall be] a statute for ever unto him and his seed after him. (r) In not hiding their nakedness.
Exo 28:40-43 The official dress of the sons of Aaron, i.e., of the ordinary priests, was to consist of just the same articles as Aaron’s priestly costume (Exo 28:39). But their body-coat is called weavers’ work in Exo 39:27, and was therefore quite a plain cloth, of white byssus or cotton yarn, though it was whole throughout, ἀῤῥαφος without seam, like the robe of Christ (Joh 19:23).
Commenting on Exodus 28:40-43