Numbers 19:11-16

11Whoever touches any dead body will be unclean for seven days. 12He must 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 and seventh days, he will not be clean. 13Anyone who touches a human corpse and fails to purify himself defiles the tabernacle of the LORD. That person must be cut off from Israel. He remains unclean, because the water of purification has not been sprinkled on him, and his uncleanness is still on him.

14This is the law when a person dies in a tent: Everyone who enters the tent and everyone already in the tent will be unclean for seven days, 15and any open container without a lid fastened on it is unclean.

16Anyone in the open field who touches someone who has been killed by the sword or has died of natural causes, or anyone who touches a human bone or a grave, will be unclean for seven days.