Numbers 19:20-21

20‘But the man who is unclean and does not purify himself from uncleanness, that person shall be cut off from the midst of the assembly, because he has 1defiled the sanctuary of the Lord; the water for impurity has not been sprinkled on him, he is unclean.

21So it shall be a perpetual statute for them. And he 2who sprinkles the water for impurity shall wash his clothes, and he who touches the water for impurity shall be unclean until evening.