7 Bible Verses about Contamination

Or when there is a person who touches anything ceremonially unclean, whether the carcass of an unclean wild animal, or the carcass of an unclean domesticated animal, or the carcass of an unclean creeping thing, even if he did not realize it, but he himself has become unclean and is guilty;

Anyone whom the man with the discharge touches without having rinsed his hands in water must wash his clothes, bathe in water, and be unclean until evening.

Anyone who touches the corpse of any dead person and does not purify himself defiles the tabernacle of the Lord. And that person must be cut off from Israel, because the water of purification was not sprinkled on him. He will be unclean; his uncleanness remains on him.

Leave! Leave! Get out of there! Don't touch anything unclean! Get out of it! Stay pure, you who carry the Lord's holy items!

The Lord spoke to Moses and Aaron: "When you enter the land of Canaan which I am about to give to you for a possession, and I put a diseased infection in a house in the land you are to possess, then whoever owns the house must come and declare to the priest, 'Something like an infection is visible to me in the house.'read more.
Then the priest will command that the house be cleared before the priest enters to examine the infection so that everything in the house does not become unclean, and afterward the priest will enter to examine the house. He is to examine the infection, and if the infection in the walls of the house consists of yellowish green or reddish eruptions, and it appears to be deeper than the surface of the wall, then the priest is to go out of the house to the doorway of the house and quarantine the house for seven days. The priest must return on the seventh day and examine it, and if the infection has spread in the walls of the house, then the priest is to command that the stones that had the infection in them be pulled and thrown outside the city into an unclean place. Then he is to have the house scraped all around on the inside, and the plaster which is scraped off must be dumped outside the city into an unclean place. They are then to take other stones and replace those stones, and he is to take other plaster and replaster the house. "If the infection returns and breaks out in the house after he has pulled out the stones, scraped the house, and it is replastered, the priest is to come and examine it, and if the infection has spread in the house, it is a malignant disease in the house. It is unclean. He must tear down the house, its stones, its wood, and all the plaster of the house, and bring all of it outside the city to an unclean place. Anyone who enters the house all the days the priest has quarantined it will be unclean until evening. Anyone who lies down in the house must wash his clothes. Anyone who eats in the house must wash his clothes.

Then the Lord spoke to Moses: "Command the Israelites to expel from the camp every leper, everyone who has a discharge, and whoever becomes defiled by a corpse. You must expel both men and women; you must put them outside the camp, so that they will not defile their camps, among which I live."read more.
So the Israelites did so, and expelled them outside the camp. As the Lord had spoken to Moses, so the Israelites did.

but that we should write them a letter telling them to abstain from things defiled by idols and from sexual immorality and from what has been strangled and from blood.