 For example, the Book of Leviticus, in Chapters 11 through 15, specifies which animals are considered spiritually clean and unclean, and defines women during menstruation and men after a nocturnal emission as unclean.The text also gives many examples of sacred contagion brought about by contact with these spiritually unclean people and things.For example, chapter 15 states that spiritual uncleanliness exists not only in the menstruating woman but also the bed she sleeps in, as well as any object placed upon that bed, and any person who touches an object placed upon that bed.