Exodus 30:18-21

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. 21They shall wash their hands and their feet, so that they may not die. It shall be a statute forever to them, even to him and to his offspring throughout their generations.”