Here are 7 Bible verses about contamination from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Numbers 5:1-4 KJV
And the LORD spake unto Moses, saying, Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by the dead: Both male and female shall ye put out, without the camp shall ye put them; that they defile not their camps, in the midst whereof I dwell. And the children of Israel did so, and put them out without the camp: as the LORD spake unto Moses, so did the children of Israel.
Leviticus 15:11 KJV
And whomsoever he toucheth that hath the issue, and hath not rinsed his hands in water, he shall wash his clothes, and bathe himself in water, and be unclean until the even.
Numbers 19:13 KJV
Whosoever toucheth the dead body of any man that is dead, and purifieth not himself, defileth the tabernacle of the LORD; and that soul shall be cut off from Israel: because the water of separation was not sprinkled upon him, he shall be unclean; his uncleanness is yet upon him.
Leviticus 14:33-47 KJV
And the LORD spake unto Moses and unto Aaron, saying, When ye be come into the land of Canaan, which I give to you for a possession, and I put the plague of leprosy in a house of the land of your possession; And he that owneth the house shall come and tell the priest, saying, It seemeth to me there is as it were a plague in the house: Then the priest shall command that they empty the house, before the priest go into it to see the plague, that all that is in the house be not made unclean: and afterward the priest shall go in to see the house: And he shall look on the plague, and, behold, if the plague be in the walls of the house with hollow strakes, greenish or reddish, which in sight are lower than the wall; Then the priest shall go out of the house to the door of the house, and shut up the house seven days: And the priest shall come again the seventh day, and shall look: and, behold, if the plague be spread in the walls of the house; Then the priest shall command that they take away the stones in which the plague is, and they shall cast them into an unclean place without the city: And he shall cause the house to be scraped within round about, and they shall pour out the dust that they scrape off without the city into an unclean place: And they shall take other stones, and put them in the place of those stones; and he shall take other morter, and shall plaister the house. And if the plague come again, and break out in the house, after that he hath taken away the stones, and after he hath scraped the house, and after it is plaistered; Then the priest shall come and look, and, behold, if the plague be spread in the house, it is a fretting leprosy in the house: it is unclean. And he shall break down the house, the stones of it, and the timber thereof, and all the morter of the house; and he shall carry them forth out of the city into an unclean place. Moreover he that goeth into the house all the while that it is shut up shall be unclean until the even. And he that lieth in the house shall wash his clothes; and he that eateth in the house shall wash his clothes.
Leviticus 5:2 KJV
Or if a soul touch any unclean thing, whether it be a carcase of an unclean beast, or a carcase of unclean cattle, or the carcase of unclean creeping things, and if it be hidden from him; he also shall be unclean, and guilty.
Isaiah 52:11 KJV
Depart ye, depart ye, go ye out from thence, touch no unclean thing; go ye out of the midst of her; be ye clean, that bear the vessels of the LORD.
Acts 15:20 KJV
But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood.