Numbers 19:9

9 And a man who is clean shall gather up the ashes of the heifer, and deposit them outside the camp in a clean place; and they shall be kept for the congregation of the people of Israel for the water for impurity, for the removal of sin.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.

Numbers 19:13-20

13 Whoever touches a dead person, the body of any man who has died, and does not cleanse himself, defiles the tabernacle of the LORD, and that person shall be cut off from Israel; because the water for impurity was not thrown upon him, he shall be unclean; his uncleanness is still on him.
14 "This is the law when a man dies in a tent: every one who comes into the tent, and every one who is in the tent, shall be unclean seven days.
15 And every open vessel, which has no cover fastened upon it, is unclean.
16 Whoever in the open field touches one who is slain with a sword, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.
17 For the unclean they shall take some ashes of the burnt sin offering, and running water shall be added in a vessel;
18 then a clean person shall take hyssop, and dip it in the water, and sprinkle it upon the tent, and upon all the furnishings, and upon the persons who were there, and upon him who touched the bone, or the slain, or the dead, or the grave;
19 and the clean person shall sprinkle upon the unclean on the third day and on the seventh day; thus on the seventh day he shall cleanse him, and he shall wash his clothes and bathe himself in water, and at evening he shall be clean.
20 "But the man who is unclean and does not cleanse himself, that person shall be cut off from the midst of the assembly, since he has defiled the sanctuary of the LORD; because the water for impurity has not been thrown upon him, he is unclean.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.