Numbers 19:14-16

14“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.

15Any open container in the tent that was not covered with a lid is also defiled.

16And 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.