Leviticus 15:31 in the King James Version
Thus shall ye separate the children of Israel from their uncleanness; that they die not in their uncleanness, when they defile my tabernacle that is among them.
Context
30 The priest shall offer the one for a sin offering, and the other for a burnt offering; and the priest shall make atonement for her before the LORD for the uncleanness of her discharge.
31 “‘Thus you shall separate the children of Israel from their uncleanness, so they will not die in their uncleanness when they defile my tabernacle that is among them.’”
32 This is the law of him who has a discharge, and of him who has an emission of semen, so that he is unclean by it;