'Be Clean' in the Bible

The same shall purify himself with it on the third day, and on the seventh day he shall be clean, but if he does not purify himself the third day, then the seventh day he shall not be clean.

And the clean man shall sprinkle upon the unclean on the third day, and on the seventh day. And on the seventh day he shall purify him. And he shall wash his clothes, and bathe himself in water, and shall be clean at evening.

everything which may go into fire--ye shall make to go through the fire, and it shall be clean. Nevertheless it shall be purified with the water for impurity. And all that may not go into fire ye shall make to go through the water.

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