In Judaism there are notions of taharah (purity) and tumah (an absence of taharah). They have nothing to do with good and bad but rather with different states of being, and they are most often related to life and death and to holy spaces and times. Jewish concepts and guidelines of purity and impurity come from the Bible and from Judaism's oral tradition as recorded in the Mishna and Talmud, Judaism's central books of law and tradition.