Thus they are to wash their hands and feet so that they will not die; this shall be a permanent statute for Aaron and his descendants for the generations to come.”
Orders are here given, 1. For the making of a laver, or font, of brass, a large vessel, that would contain a good quantity of water, which was to be set near the door of the tabernacle, Exo 30:18. The foot of brass, it is supposed, was so contrived as to receive the water, which was let into it out of the laver by spouts or cocks.
Commenting on Exodus 30:17-21
So they shall wash their hands and their feet, that they die not,.... By the immediate hand of God, who would so greatly resent such a neglect of his command; and by how much easier it was to perform it, by so much the more were they inexcusable, and to be treated with greater severity; and this is repeated, that they might carefully observe it...
So they shall wash their hands and their feet, that they die not: and it shall be a statute for ever to them, [even] to him and to his seed throughout their generations. (l) So long as the priesthood shall last.