Exodus 30
17 And the Lord said to Moses,
18 Ref You are to make a brass washing-vessel, with a brass base; and put it between the Tent of meeting and the altar, with water in it;
19 Ref That it may be used by Aaron and his sons for washing their hands and feet;
20 Ref Whenever they go into the Tent of meeting they are to be washed with water, to keep them from death; and whenever they come near to do the work of the altar, or to make an offering by fire to the Lord,
21 Ref Their hands and feet are to be washed. so that they may be safe from death: this is an order to them for ever; to him and his seed from generation to generation.