'Be Clean' in the Bible

He shall purify himself with the water on the third day, and on the seventh day he shall be clean: but if he purify not himself the third day, then the seventh day he shall not be clean.

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 evening.

Everything that can endure the fire, you shall make it go through the fire, and it shall be clean: nevertheless it shall be purified with the water of purification: and all that cannot endure the fire you shall make go through the water.

And you shall wash your clothes on the seventh day, and you shall be clean, and afterward you shall come into the camp

So you shall not pollute the land in which you are: for blood defiles the land: and the land cannot be cleansed of the blood that is shed therein, except by the blood of him that shed it.