Numbers 19:19-21

MLV(i) 19 And the clean man will sprinkle upon the unclean on the third day and on the seventh day. And on the seventh day he will purify him. And he will wash his clothes and bathe himself in water and will be clean at evening.
20 But the man who will be unclean and will not purify himself, that soul will be cut off from the midst of the assembly, because he has defiled the sanctuary of Jehovah. The water for impurity has not been sprinkled upon him; he is unclean. 21 And it will be an everlasting statute to them. And he who sprinkles the water for impurity will wash his clothes and he who touches the water for impurity will be unclean until evening.