Exodus 19:10

19:10 The Lord said to Moses, “Go to the people and sanctify them today and tomorrow, and make them wash their clothes

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 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 40:32

40:32 Whenever they entered the tent of meeting, and whenever they approached the altar, they would wash, just as the Lord had commanded Moses.