That the waters of separation defile one who is clean, and cleanse the unclean from pollution by a dead body (Num. 19:19-22). With reference to these modes of uncleanness, most of the rules and regulations concerning each of them are explained in the Pentateuch

Numbers 19:19–22

KJV

And the clean person shall sprinkle upon the unclean on the third day, and on the seventh day: and on the seventh day he shall purify himself, and wash his clothes, and bathe himself in water, and shall be clean at even. But the man that shall be unclean, and shall not purify himself, that soul shall be cut off from among the congregation, because he hath defiled the sanctuary of the LORD : the water of separation hath not been sprinkled upon him; he is unclean. And it shall be a perpetual statute unto them, that he that sprinkleth the water of separation shall wash his clothes; and he that toucheth the water of separation shall be unclean until even. And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth it shall be unclean until even.

ASV

and the clean person shall sprinkle upon the unclean on the third day, and on the seventh day: and on the seventh day he shall purify him; and he shall wash his clothes, and bathe himself in water, and shall be clean at even. But the man that shall be unclean, and shall not purify himself, that soul shall be cut off from the midst of the assembly, because he hath defiled the sanctuary of Jehovah: the water for impurity hath not been sprinkled upon him; he is unclean. And it shall be a perpetual statute unto them: and he that sprinkleth the water for impurity shall wash his clothes, and he that toucheth the water for impurity shall be unclean until even. And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth it shall be unclean until even.

WEB

The clean person shall sprinkle on the unclean on the third day, and on the seventh day. On the seventh day, he shall purify him. He shall wash his clothes and bathe himself in water, and shall be clean at evening. But the man who shall be unclean, and shall not purify himself, that soul shall be cut off from among the assembly, because he has defiled the sanctuary of the LORD. The water for impurity has not been sprinkled on him. He is unclean. It shall be a perpetual statute to them. He who sprinkles the water for impurity shall wash his clothes, and he who touches the water for impurity shall be unclean until evening. “Whatever the unclean person touches shall be unclean; and the soul that touches it shall be unclean until evening.”

JPS

And the clean person shall sprinkle upon the unclean on the third day, and on the seventh day; and on the seventh day he shall purify him; and he shall wash his clothes, and bathe himself in water, and shall be clean at even. But the man that shall be unclean, and shall not purify himself, that soul shall be cut off from the midst of the assembly, because he hath defiled the sanctuary of the LORD; the water of sprinkling hath not been dashed against him: he is unclean. And it shall be a perpetual statute unto them; and he that sprinkleth the water of sprinkling shall wash his clothes; and he that toucheth the water of sprinkling shall be unclean until even. And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth him shall be unclean until even.