Numbers 19:7
“Then the priest shall wash his clothes, and he shall bathe his flesh in water, and afterward he shall come into the camp, and the priest shall be unclean until the even.”
And one shall burn the heifer in his sight; her skin, and her flesh, and her blood, with her dung, shall he burn:
And the priest shall take cedar wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.
Then the priest shall wash his clothes, and he shall bathe his flesh in water, and afterward he shall come into the camp, and the priest shall be unclean until the even.
And he that burneth her shall wash his clothes in water, and bathe his flesh in water, and shall be unclean until the even.
And a man that is clean shall gather up the ashes of the heifer, and lay them up without the camp in a clean place, and it shall be kept for the congregation of the children of Israel for a water of separation: it is a purification for sin.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Related Verses
“And he that burneth her shall wash his clothes in water, and bathe his flesh in water, and shall be unclean until the even.”
“And the clean person shall sprinkle upon the unclean on the third day, and on the seventh day: and on the seventh day he shall purify himself, and wash his clothes, and bathe himself in water, and shall be clean at even.”
“And he that toucheth the flesh of him that hath the issue shall wash his clothes, and bathe himself in water, and be unclean until the even.”
“And whosoever toucheth those things shall be unclean, and shall wash his clothes, and bathe himself in water, and be unclean until the even.”
“And ye shall wash your clothes on the seventh day, and ye shall be clean, and afterward ye shall come into the camp.”