7 Bible Verses about Contamination

Or if someone touches any [ceremonially] unclean thing—whether the carcass of an unclean wild animal or the carcass of an unclean domestic animal or the carcass of unclean creeping things—even if he is unaware of it, he has become unclean, and he will be guilty.

Whomever the one with the discharge touches without rinsing his hands in water shall wash his clothes and bathe in water, and be unclean until evening.

Whoever touches a corpse, the body of anyone who has died, and does not purify himself, defiles the tabernacle of the Lord; and that person shall be cut off from Israel [that is, excluded from the atonement made for them]. 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 (the lands of exile),
Touch no unclean thing;
Go out of the midst of her (Babylon), purify yourselves,
You who carry the articles of the Lord [on your journey from there].

The Lord further spoke to Moses and Aaron, saying, “When you come into the land of Canaan, which I am giving you as a possession, and I put a mark of leprosy on a house in your land, then the one who owns the house shall come and tell the priest, ‘I have seen something that looks like a mark of leprosy in my house.’ read more.
The priest shall order that they empty the house before he goes in to examine the mark, so that everything in the house will not have to be declared unclean; afterward he shall go in to see the house. He shall examine the mark, and if the mark on the walls of the house has greenish or reddish depressions and appears deeper than the surface, the priest shall go out of the house, to the doorway, and quarantine the house for seven days. The priest shall return on the seventh day and look; and if the mark has spread on the walls of the house, he shall order them to tear out the contaminated stones and throw them into an unclean place outside the city. He shall have the entire inside area of the house scraped, and the plaster that is scraped off shall be dumped in an unclean place outside the city. Then they shall take new stones and replace the [contaminated] stones, and he shall take plaster and replaster the house. “If, however, the mark breaks out again in the house after he has removed the stones and has scraped and replastered the house, then the priest shall come and look again, and if the mark has spread in the house, it is a malignant leprosy in the house; it is [ceremonially] unclean. He shall tear down the house—its stones and its timber and all the plaster of the house—and shall take everything outside the city to an unclean place. Moreover, whoever goes into the house during the time that it is quarantined becomes unclean until evening. And whoever lies down in the house [to rest] shall wash his clothes, and whoever eats in the house shall wash his clothes.

The Lord spoke to Moses, saying, “Command the Israelites to send away from the camp every leper and everyone who has a discharge, and whoever is defiled [that is, ceremonially unclean] by [coming in contact with] the dead. 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 Israelites did so, and sent them outside the camp; just as the Lord had said to Moses, so the Israelites did.

but that we write to them that they are to abstain from anything that has been contaminated by [being offered to] idols and from sexual impurity and from [eating the meat of] what has been strangled and from [the consumption of] blood.