Numbers 19:7-9

New Century Version

⁷ After the priest has washed himself and his clothes with water, he may come back into the camp, but he will be unclean until evening. ⁸ The man who burns the cow must wash himself and his clothes in water; he will be unclean until evening.

⁹ “Then someone who is clean will collect the ashes from the cow and put them in a clean place outside the camp. The Israelites will keep these ashes to use in the cleansing water, in a special ceremony to cleanse away sin.