Taken out of that laver, Exodus 30:18. This signified the universal pollution of all men, and the absolute need they have of washing, especially when they are to draw nigh to God. And this outward washing was only typical of their spiritual washing by the blood and Spirit of Christ in order to their acceptance with God.
Related Commentaries of Exodus 29:4
Exodus 29:4
4 And Aaron and his sons thou shalt bring unto the door of the tabernacle of the congregation, and shalt wash them with water.