Numbers 19:11-13

11‘He who touches the dead body of anyone shall be unclean seven days.

12He shall purify himself with the water on the third day and on the seventh day; 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.

13Whoever touches the body of anyone who has died, and does not purify himself, defiles the tabernacle of the Lord. That person shall be cut off from Israel. He shall be unclean, because the water of purification was not sprinkled on him; his uncleanness is still on him.