Numbers 19:7-8, 21

The priest shall then wash his clothes and bathe his body in water, and afterward come into the camp, but the priest shall be unclean until evening. The one who burns it shall also wash his clothes in water and bathe his body in water, and shall be unclean until evening.

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