Exodus 30:18-20

American Standard Version

¹⁸ Thou shalt also make a laver of brass, and the base thereof of brass, whereat to wash. And thou shalt put it between the tent of meeting and the altar, and thou shalt put water therein. ¹⁹ And Aaron and his sons shall wash their hands and their feet thereat: ²⁰ when they go into the tent of meeting, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn an offering made by fire unto Jehovah.