Numbers 19:11-16

“All those who touch a dead human body will be ceremonially unclean for seven days. They must purify themselves on the third and seventh days with the water of purification; then they will be purified. But if they do not do this on the third and seventh days, they will continue to be unclean even after the seventh day. All those who touch a dead body and do not purify themselves in the proper way defile the LORD’s Tabernacle, and they will be cut off from the community of Israel. Since the water of purification was not sprinkled on them, their defilement continues. “This is the ritual law that applies when someone dies inside a tent: All those who enter that tent and those who were inside when the death occurred will be ceremonially unclean for seven days. Any open container in the tent that was not covered with a lid is also defiled. And if someone in an open field touches the corpse of someone who was killed with a sword or who died a natural death, or if someone touches a human bone or a grave, that person will be defiled for seven days.