Numbers 19:8-10

New Century Version

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. ¹⁰ The man who collected the cow’s ashes must wash his clothes and be unclean until evening. This is a lasting rule for the Israelites and for the foreigners among them.