Exodus 19:14 So Moses went down from the mountain to the people and sanctified the people, and they washed their clothes.
Exodus 30:18-21 “You shall also make a laver of bronze, with its base also of bronze, for washing. You shall put it between the tabernacle of meeting and the altar. And you shall put water in it, for Aaron and his sons shall wash their hands and their feet in water from it. When they go into the tabernacle of meeting, or when they come near the altar to minister, to burn an offering made by fire to the LORD, they shall wash with water, lest they die. So they shall wash their hands and their feet, lest they die. And it shall be a statute forever to them—to him and his descendants throughout their generations.”
Haggai 2:11-14 "Thus says the LORD of hosts: "Now, ask the priests concerning the law, saying, "If one carries holy meat in the fold of his garment, and with the edge he touches bread or stew, wine or oil, or any food, will it become holy?""" Then the priests answered and said, "No." And Haggai said, "If one who is unclean because of a dead body touches any of these, will it be unclean?" So the priests answered and said, "It shall be unclean." Then Haggai answered and said, ""So is this people, and so is this nation before Me," says the LORD, "and so is every work of their hands; and what they offer there is unclean.
