The Lord said to Moses,
"Make a bronze basin with a bronze base. Place it between the Tent and the altar, and put water in it. 1
References for Exodus 30:18
30.18 Ex 38.8.
Aaron and his sons are to use the water to wash their hands and feet
before they go into the Tent or approach the altar to offer the food offering. Then they will not be killed.
They must wash their hands and feet, so that they will not die. This is a rule which they and their descendants are to observe forever."