What is impurity? How do people contract it? How do they get rid of it? And why does any of this matter for understanding Jesus? In this episode, we offer a whistle-stop tour of the ritual purity system in Leviticus 12–15, Numbers 5, and Numbers 19. We discuss the meaning of holy/profane/pure/impure, outline the sources of impurity, and explain how the sacrificial system fits into all this.