'Purify' in the Bible

He shall purify himself with it 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 shall sprinkle it on the unclean on the third day, and on the seventh day; and he shall purify him on the seventh day; and he shall wash his garments, and bathe himself in water, and shall be clean at even.

And the man that is unclean, and doth not purify himself, that soul shall be cut off from the midst of the congregation, for he hath defiled the sanctuary of Jehovah: the water of separation hath not been sprinkled on him: he is unclean.

And encamp outside the camp seven days; whoever hath killed a person, and whoever hath touched any slain; ye shall purify yourselves on the third day, and on the seventh day, you and your captives.

And every garment, and every vessel of skin, and all work of goat's hair, and every utensil of wood shall ye purify.