Leviticus 22:4-8

4Whatsoever man of the seed of Aaron is a leper, or hath a flux, he shall not eat of the holy things, until he is clean. And he that toucheth any one that is unclean by a dead person, or a man whose seed of copulation hath passed from him;

5or a man that toucheth any crawling thing whereby he becometh unclean, or a man by whom he may become unclean, whatever may be his uncleanness,

6— a person that toucheth any such shall be unclean until even, and shall not eat of the holy things; but he shall bathe his flesh with water,

7and when the sun goeth down, he shall be clean, and may afterwards eat of the holy things; for it is his food.

8Of a dead carcase and what is torn shall he not eat, to make himself unclean therewith: I am Jehovah.