7 Bible Verses about Contamination

Or if a person touches any unclean thing, whether a carcass of an unclean beast or the carcass of unclean cattle or a carcass of unclean swarming things, though it is hidden from him and he is unclean, then he will be guilty.

Likewise, whomever the one with the discharge touches without having rinsed his hands in water shall wash his clothes and bathe in water and be unclean until evening.

Anyone who touches a corpse, the body of a man who has died, and does not purify himself, defiles the tabernacle of the Lord; and that person shall be cut off from Israel. Because the water for impurity was not sprinkled on him, he shall be unclean; his uncleanness is still on him.

Depart, depart, go out from there,
Touch nothing unclean;
Go out of the midst of her, purify yourselves,
You who carry the vessels of the Lord.

The Lord further spoke to Moses and to Aaron, saying: “When you enter the land of Canaan, which I give you for a possession, and I put a mark of leprosy on a house in the land of your possession, then the one who owns the house shall come and tell the priest, saying, ‘Something like a mark of leprosy has become visible to me in the house.’read more.
The priest shall then command that they empty the house before the priest goes in to look at the mark, so that everything in the house need not become unclean; and afterward the priest shall go in to look at the house. So he shall look at the mark, and if the mark on the walls of the house has greenish or reddish depressions and appears deeper than the surface, then the priest shall come out of the house, to the doorway, and quarantine the house for seven days. The priest shall return on the seventh day and make an inspection. If the mark has indeed spread in the walls of the house, then the priest shall order them to tear out the stones with the mark in them and throw them away at an unclean place outside the city. He shall have the house scraped all around inside, and they shall dump the plaster that they scrape off at an unclean place outside the city. Then they shall take other stones and replace those stones, and he shall take other plaster and replaster the house. “If, however, the mark breaks out again in the house after he has torn out the stones and scraped the house, and after it has been replastered, then the priest shall come in and make an inspection. If he sees that the mark has indeed spread in the house, it is a malignant mark in the house; it is unclean. He shall therefore tear down the house, its stones, and its timbers, and all the plaster of the house, and he shall take them outside the city to an unclean place. Moreover, whoever goes into the house during the time that he has quarantined it, becomes unclean until evening. Likewise, whoever lies down in the house shall wash his clothes, and whoever eats in the house shall wash his clothes.

Then the Lord spoke to Moses, saying, “Command the sons of Israel that they send away from the camp every leper and everyone having a discharge and everyone who is unclean because of a dead person. You shall send away both male and female; you shall send them outside the camp so that they will not defile their camp where I dwell in their midst.”read more.
The sons of Israel did so and sent them outside the camp; just as the Lord had spoken to Moses, thus the sons of Israel did.

but that we write to them that they abstain from things contaminated by idols and from fornication and from what is strangled and from blood.