Numbers 19:17-21

17Then for the person who is not clean, you must take some of the ashes of the young red cow. That is the cow to make people clean. You must put these ashes into a pot and you must mix them with water from a river.

18Then a person who is clean must take hyssop. He must put it into the water. Then he must use it to splash the water on the tent and on everything that is in it. He must also splash the water on all the people who have been there. And he must splash it on the person who touched the bone or the dead body or the grave.

19And the clean person must splash the water on the unclean person on the third day too. And he must do it on the seventh day. On the seventh day he will make the person clean again. Then the person who had not been clean must wash his clothes. And he must wash himself in water. In the evening, that person will become clean.

20The person who is not clean might not wash himself and his clothes. If he does not do it, you must make that person separate from the people. That is because he has made the Lord's Holy Place become unclean. Because the priest did not splash special water on him he will not be clean.

21This rule is for now and for ever. The man who splashes the special water must also wash his clothes. Any person who touches the special water will not be clean until evening.