Exodus 40:31

29He set the altar of burnt offering at the door of the tabernacle of the Tent of Meeting, and offered on it the burnt offering and the meal offering, as the LORD commanded Moses.

30He set the basin between the Tent of Meeting and the altar, and put water therein, with which to wash.

31Moses, Aaron, and his sons washed their hands and their feet there.

32When they went into the Tent of Meeting, and when they came near to the altar, they washed, as the LORD commanded Moses.

33He raised up the court around the tabernacle and the altar, and set up the screen of the gate of the court. So Moses finished the work.