Exodus 40:31

31 And Moses and Aaron and his sons washed their hands and their feet out of it:

Exodus 40:31 Meaning and Commentary

Exodus 40:31

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.

Exodus 40:31 In-Context

29 And he put the altar of burnt-offering at the entrance to the tabernacle of the tent of meeting, and offered on it the burnt-offering and the oblation; as Jehovah had commanded Moses.

30 And he set the laver between the tent of meeting and the altar, and put water in it for washing.

31 And Moses and Aaron and his sons washed their hands and their feet out of it:

32 when they went into the tent of meeting, and when they drew near to the altar, they washed; as Jehovah had commanded Moses.

33 And he set up the court round about the tabernacle and the altar, and hung up the curtain of the gate of the court. And so Moses finished the work.