Exodus 40:29-33

29He placed the altar of burnt offering at the entrance to the tabernacle, the tent of meeting, and offered the burnt offering and the grain offering on it, just as the Lord had commanded him.

30He set the basin between the tent of meeting and the altar and put water in it for washing.

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

32They washed whenever they came to the tent of meeting and approached the altar, just as the Lord had commanded Moses.

33Next Moses set up the surrounding courtyard for the tabernacle and the altar and hung a screen for the gate of the courtyard. So Moses finished the work.