Anyone out in the open field who touches a dead body, whether killed by a sword or was killed by a natural cause, or touches a human bone or a grave, shall be unclean seven days.
Then Adonai said to Moses, “Speak to the kohanim, the sons of Aaron, and say to them: A kohen is not to allow himself to become unclean for the dead among his people,
“Any of you who has killed anyone or touched the body of anyone who has been killed must stay outside the camp for seven days. You must purify yourselves, on the third and seventh days—you and your captives.
However, there were some men who could not celebrate Passover because of being defiled by a dead body. So they came to Moses and Aaron on that same day,
“Woe to you, Torah scholars and Pharisees, hypocrites! For you are like whitewashed tombs, which look beautiful on the outside but inside are full of dead men’s bones and everything unclean.