'Purify' in the Bible

"Take the descendants of Levi from the Israelis and purify them.

This is what you are to do for them in order to purify them: Sprinkle purifying water over them, have them shave their skin, and then have them wash their garments, and they will be purified.

The descendants of Levi therefore purified themselves, washed their clothes, and then Aaron presented them as wave offerings to the LORD. Aaron provided atonement for them to purify them.

He is to purify himself on the third day and he will be clean on the seventh day. But if he can't purify himself on the third day then he can't be clean on the seventh day.

Anyone who comes in contact with a dead person (that is, with the corpse of a human being who has died), but who does not purify himself, defiles the LORD's tent. That person is to be eliminated from Israel, because the water of impurity wasn't sprinkled on him. He remains unclean and his uncleanness will remain with him.

The clean person is to sprinkle the unclean person on the third day and seventh day and then he is to purify himself on the seventh day, wash his clothes, and bathe with water. He is to be considered clean at evening.

"The person who is unclean but who doesn't purify himself is to be eliminated from contact with the assembly, since he has defiled the LORD's sanctuary and the water of impurity wasn't sprinkled on him. He is to be considered unclean

"Now you are to stay outside the camp for seven days, after which any of you who has killed a person or touched someone who was killed may purify yourselves on the third day. You and your captives will be pure on the seventh day.

Furthermore, you are to purify every garment that is, everything made of leather, goat's hair, or containing wood."