Leviticus 17:15-16

15An Israelite or a foreign person may find a dead animal. If he eats it, he must wash his clothes and his body. He will be unclean until evening. Then he will become clean. A person might find an animal or a bird that a wild animal has killed. He must wash his clothes and his body. He will be unclean until evening.

16If that person does not wash his clothes and his body, it is his own mistake.’