Numbers 19:11

9“A man who is clean shall gather up the ashes of the heifer, and lay them up outside of the camp in a clean place; and it shall be kept for the congregation of the children of Israel for use in water for cleansing impurity. It is a sin offering.

10He who gathers the ashes of the heifer shall wash his clothes, and be unclean until the evening. It shall be to the children of Israel, and to the stranger who lives as a foreigner among them, for a statute forever.

11“He who touches the dead body of any man shall be unclean seven days.

12He shall purify himself with water on the third day, and on the seventh day he shall be clean; but if he doesn’t purify himself the third day, then the seventh day he shall not be clean.

13Whoever touches a dead person, the body of a man who has died, and doesn’t purify himself, defiles the LORD’s tabernacle; and that soul shall be cut off from Israel; because the water for impurity was not sprinkled on him, he shall be unclean. His uncleanness is yet on him.