Exodus 30:16-20
English Standard Version
17The Lord said to Moses,
18"You shall also make a basin of bronze, with its stand of bronze, for washing. You shall put it between the tent of meeting and the altar, and you shall put water in it,
19with which Aaron and his sons shall wash their hands and their feet.
20When they go into the tent of meeting, or when they come near the altar to minister, to burn a food offering to the Lord, they shall wash with water, so that they may not die.