Exodus 30:17-21 (CJB)

¹⁷ Adonai said to Moshe, ¹⁸ “You are to make a basin of bronze, with a base of bronze, for washing. Place it between the tent of meeting and the altar, and put water in it. ¹⁹ Aharon and his sons will wash their hands and feet there ²⁰ when they enter the tent of meeting — they are to wash with water, so that they won’t die. Also when they approach the altar to minister by burning an offering for Adonai, ²¹ they are to wash their hands and feet, so that they won’t die. This is to be a perpetual law for them through all their generations.”