Exodus 29:4

29:4 “You are to present Aaron and his sons at the entrance of the tent of meeting. You are to wash them with water

Exodus 29:17

29:17 Then you are to cut the ram into pieces and wash the entrails and its legs and put them on its pieces and on its head

Exodus 30:21

30:21 they must wash their hands and their feet so that they do not die. And this will be a perpetual ordinance for them and for their descendants throughout their generations.”

Exodus 40:12

40:12 “You are to bring Aaron and his sons to the entrance of the tent of meeting and wash them with water.

Exodus 40:30-31

40:30 Then he put the large basin between the tent of meeting and the altar and put water in it for washing. 40:31 Moses and Aaron and his sons would wash their hands and their feet from it.