'Purify' in the Bible

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

Whoever touches a dead person, the body of a man who has died, and doesn't purify himself, defiles the tabernacle of Yahweh; and that soul shall be cut off from Israel: because the water for impurity was not sprinkled on him, he shall be unclean; his uncleanness is yet on him.

and the clean person shall sprinkle on 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.

But the man who shall be unclean, and shall not purify himself, that soul shall be cut off from the midst of the assembly, because he has defiled the sanctuary of Yahweh: the water for impurity has not been sprinkled on him; he is unclean.

"Encamp outside of the camp seven days: whoever has killed any person, and whoever has touched any slain, purify yourselves on the third day and on the seventh day, you and your captives.

As to every garment, and all that is made of skin, and all work of goats' [hair], and all things made of wood, you shall purify yourselves."