Numbers 19:7-9

Amplified Bible

⁷ Then the priest shall wash his clothes and bathe his body in water; and afterward come into the camp, but he shall be [ceremonially] unclean until evening. ⁸ The one who burns the heifer shall wash his clothes and bathe his body in water, and shall be unclean until evening. ⁹ Now a man who is [ceremonially] clean shall collect the ashes of the heifer and deposit them outside the camp in a clean place, and the congregation of the Israelites shall keep it for ^[a]water to remove impurity; it is [to be used for] purification from sin.