Leviticus 22:3-5

³Tell them that for all future time, if any of their descendants comes near to the sacred offerings that the Israeli people dedicate to me while he is unfit to work for me, that person will no longer be allowed to work for me. I, Yahweh, am commanding this.

⁴If any descendant of Aaron has a contagious skin disease or a discharge from his sexual organs, he is not allowed to eat any of the sacred offerings until he is cured. He will also be unfit for his work if he touches anything which has become unacceptable to me because it has touched a corpse, or if he touches anyone who as an emission of semen,

⁵or if he touches anything that crawls on the ground, or if he touches any person who causes him to be unfit for his work.