Exodus 40:30-32

30Moses put the large bowl for water between the Tent of Meeting and the altar. He put water in it for the priests to wash themselves.

31Moses and Aaron and Aaron's sons used the water to wash their hands and their feet.

32They washed themselves every time that they went into the Tent of Meeting. They also washed themselves before they went to offer sacrifices at the altar. They did what the Lord had commanded Moses to do.