"Males or females that are unclean through running issue, and a woman after childbirth, must in addition bring a sacrifice, because their uncleanness occurs less frequently than that of women in their separation. All these cases of uncleanliness, viz., running issue of males or females, menstruations, leprosy, dead bodies of human beings, carcases of beasts and creeping things, and issue of semen, are sources of dirt and filth."