Leviticus 22:2-7

2“Tell Aaron and his sons that they must respect the holy offerings which the Israelites set apart for me. In this way they will not dishonor my holy name. I am the Lord.

3“Tell them: In future generations if any of your descendants, while unclean, comes near the holy offerings the Israelites set apart for the Lord, that person must be excluded from my presence. I am the Lord.

4“No descendant of Aaron who has a skin disease or a discharge may eat any of the holy offerings until he is clean. Any person who has an emission of semen or touches a dead body,

5an unclean swarming creature or an unclean person

6will be unclean until evening. He must not eat any of the holy offerings unless he has washed himself.

7When the sun has set, he will be clean. Then he may eat the holy offerings because they are his food.