Numbers 19:20-21

20‘But the person who is unclean and does not purify himself, 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, so he is unclean.

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