Numbers 19:20-21

20“But those who become defiled and do not purify themselves will be cut off from the community, for they have defiled the sanctuary of the Lord. Since the water of purification has not been sprinkled on them, they remain defiled.

21This is a permanent law for the people. Those who sprinkle the water of purification must afterward wash their clothes, and anyone who then touches the water used for purification will remain defiled until evening.