Numbers 19:18-20 Amplified Bible, Classic Edition (AMPC)
18 And a clean person shall take hyssop and dip it in the water and sprinkle it upon the tent, and upon all the vessels, and upon the persons who were there, and upon him who touched the bone, or the slain, or the naturally dead, or the grave.
19 And the clean person shall sprinkle [the water for purification] upon the unclean person on the third day and on the seventh day, and on the seventh day the unclean man shall purify himself, and wash his clothes and bathe himself in water, and shall be clean at evening.
20 But the man who is unclean and does not purify himself, that person shall be cut off from among the congregation, because he has defiled the sanctuary of the Lord. The water for purification has not been sprinkled upon him; he is unclean.
Numbers 19:18-20 New International Version (NIV)
18 Then a man who is ceremonially clean is to take some hyssop, dip it in the water and sprinkle the tent and all the furnishings and the people who were there. He must also sprinkle anyone who has touched a human bone or a grave or anyone who has been killed or anyone who has died a natural death. 19 The man who is clean is to sprinkle those who are unclean on the third and seventh days, and on the seventh day he is to purify them. Those who are being cleansed must wash their clothes and bathe with water, and that evening they will be clean. 20 But if those who are unclean do not purify themselves, they must be cut off from the community, because they have defiled the sanctuary of the Lord. The water of cleansing has not been sprinkled on them, and they are unclean.