Thou shalt also make a laver of brass, and his foot also of brass, to wash withal: and thou shalt put it between the tabernacle of the congregation and the altar, and thou shalt put water therein.

Wesley's Notes

30:18 The laver, or font was a large vessel, that would contain a good quantity of water. The foot of brass, it is supposed, was so contrived as to receive the water, which was let out of the laver, by spouts or cocks. They then had a laver for the priests only to wash in, but to us now there is a fountain opened for Judah and Jerusalem, Zech 13:1, an inexhaustible fountain of living water, so that it is our own fault if we remain in our pollution. Aaron and his sons were to wash their hands and feet at this laver every time they went in to minister. For this purpose clean water was put into the laver, fresh every day. Though they washed themselves ever so clean at their own houses, that would not serve, they must wash at the laver. This was designed, to teach them purity in all their ministrations, and to possess them with a reverence of God's holiness, and a dread of the pollutions of sin. They must not only wash and be made clean when they were first consecrated, but they must wash and be kept clean, whenever they went in to minister. He only shall stand in God's holy place that hath clean hands and a pure heart, Psa 24:3,4. And it was to teach us, who are daily to attend upon God, daily to renew our repentance for sin, and our believing application of the blood of Christ to our souls for remission.

Scofield Reference Notes

[2] laver

Laver, type of Christ cleansing us from defilement, and from "every spot or wrinkle or any such thing" Jn 13:2-10 Eph 5:25-27. It is significant that the priests could not enter the holy place after serving at the brazen altar till hands and feet were cleansed.

Jamieson-Fausset-Brown Bible Commentary

18-21. Thou shalt . make a laver of brass-Though not actually forming a component part of the furniture of the tabernacle, this vase was closely connected with it; and though from standing at the entrance it would be a familiar object, it possessed great interest and importance from the baptismal purposes to which it was applied. No data are given by which its form and size can be ascertained; but it was probably a miniature pattern of Solomon's-a circular basin.

his foot-supposed not to be the pedestal on which it rested, but a trough or shallow receptacle below, into which the water, let out from a cock or spout, flowed; for the way in which all Eastern people wash their hands or feet is by pouring upon them the water which falls into a basin. This laver was provided for the priests alone. But in the Christian dispensation, all believers are priests, and hence the apostle exhorts them how to draw near to God (Joh 13:10; Heb 10:22).

Matthew Henry's Concise Commentary

30:17-21 A large vessel of brass, holding water, was to be set near the door of the tabernacle. Aaron and his sons must wash their hands and feet at this laver, every time they went in to minister. This was to teach them purity in all their services, and to dread the pollution of sin. They must not only wash and be made clean, when first made priests, but must wash and be kept clean, whenever they went to minister. It teaches us daily to attend upon God, daily to renew our repentance for sin, and our looking to the blood of Christ for remission; for in many things we daily offend.