Numbers 19:10-14

And the one who gathers the ashes of the heifer shall wash his clothes and will be unclean until evening; and it shall be a permanent statute for the sons of Israel and for the stranger who resides among them.

‘The one who touches the dead body of any person will also be unclean for seven days.

That one shall purify himself with the water on the third day and on the seventh day, and then he will be clean; but if he does not purify himself on the third day and on the seventh day, he will not be clean.

Anyone who touches a dead body, the body of a person who has died, and does not purify himself, defiles the tabernacle of the Lord; and that person shall be cut off from Israel. Since the water for impurity was not sprinkled on him, he will be unclean; his uncleanness is still on him.

‘This is the law when a person dies in a tent: everyone who comes into the tent and everyone who is in the tent will be unclean for seven days.