Exodus 40:31
And Moses and Aaron and his sons washed their hands and their feet thereat:
And Moses and Aaron and his sons, washed their hands and their feet thereat. This laver was for the priests, and Moses, officiating as a priest, washed in it, with Aaron, and his sons, whom he was now about to consecrate to the priest's office, and invest with it by offering sacrifice for them; Jarchi says this was on the eighth day of the consecration.
X
X