Numbers 19:21

¹⁹And the clean man shall sprinkle the water on the unclean on the third day and on the seventh day, and on the seventh day he shall purify himself; and the other shall wash his garments, and bathe himself in water, and shall be unclean until evening.

²⁰And whatever man shall be defiled and shall not purify himself, that soul shall be cut off from the midst of the congregation, because he has defiled the holy things of the Lord, because the water of sprinkling has not been sprinkled upon him; he is unclean.

— Numbers 19:21 —

²²And whatsoever the unclean man shall touch shall be unclean, and the soul that touches it shall be unclean till evening.