“A house desecrated by mildew, mold, or fungus would be a defiled place to live in, so drastic measures had to be taken.” – Leviticus 14:4

The dangers of mold have been known for thousands of years. In ancient times, the mold we see in houses today would have been called the plague and the priests were the mold inspectors and remediators.

Evidence of these facts can be found in the bible in the Book of Leviticus. Here we find the oldest known literature describing the instructions for inspecting and cleaning mold. This is the word of God on mold that was given to the head Levite priests, Moses and Aaron.

The LORD said to Moses and Aaron,  “When you enter the land of Canaan, which I am giving you as your possession, and I put a spreading mildew in a house in that land, the owner of the house must go and tell the priest, ‘I have seen something that looks like mildew in my house.’ The priest is to order the house to be emptied before he goes in to examine the mildew, so that nothing in the house will be pronounced unclean.

After this the priest is to go in and inspect the house. He is to examine the mildew on the walls, and if it has greenish or reddish depressions that appear to be deeper than the surface of the wall, the priest shall go out the doorway of the house and close it up for seven days. On the seventh day the priest shall return to inspect the house.

If the mildew has spread on the walls, he is to order that the contaminated stones be torn out and thrown into an unclean place outside the town. He must have all the inside walls of the house scraped and the material that is scraped off dumped into an unclean place outside the town. Then they are to take other stones to replace these and take new clay and plaster the house.

“If the mildew reappears in the house after the stones have been torn out and the house scraped and plastered,  the priest is to go and examine it and, if the mildew has spread in the house, it is a destructive mildew; the house is unclean.  It must be torn down—its stones, timbers and all the plaster—and taken out of the town to an unclean place.

“Anyone who goes into the house while it is closed up will be unclean till evening. Anyone who sleeps or eats in the house must wash his clothes.

“But if the priest comes to examine it and the mildew has not spread after the house has been plastered, he shall pronounce the house clean, because the mildew is gone.  To purify the house he is to take two birds and some cedar wood, scarlet yarn and hyssop.  He shall kill one of the birds over fresh water in a clay pot.

Then he is to take the cedar wood, the hyssop, the scarlet yarn and the live bird, dip them into the blood of the dead bird and the fresh water, and sprinkle the house seven times.  He shall purify the house with the bird’s blood, the fresh water, the live bird, the cedar wood, the hyssop and the scarlet yarn. 53 Then he is to release the live bird in the open fields outside the town. In this way he will make atonement for the house, and it will be clean.” – Leviticus 14:45

Regulations About Defiling Molds

“As for any fabric that is spoiled with a defiling mold—any woolen or linen clothing, any woven or knitted material of linen or wool, any leather or anything made of leather — if the affected area in the fabric, the leather, the woven or knitted material, or any leather article, is greenish or reddish, it is a defiling mold and must be shown to the priest.

The priest is to examine the affected area and isolate the article for seven days. On the seventh day he is to examine it, and if the mold has spread in the fabric, the woven or knitted material, or the leather, whatever its use, it is a persistent defiling mold; the article is unclean. He must burn the fabric, the woven or knitted material of wool or linen, or any leather article that has been spoiled; because the defiling mold is persistent, the article must be burned.

“But if, when the priest examines it, the mold has not spread in the fabric, the woven or knitted material, or the leather article, he shall order that the spoiled article be washed. Then he is to isolate it for another seven days. After the article has been washed, the priest is to examine it again, and if the mold has not changed its appearance, even though it has not spread, it is unclean. Burn it, no matter which side of the fabric has been spoiled.

If, when the priest examines it, the mold has faded after the article has been washed, he is to tear the spoiled part out of the fabric, the leather, or the woven or knitted material. But if it reappears in the fabric, in the woven or knitted material, or in the leather article, it is a spreading mold; whatever has the mold must be burned.

Any fabric, woven or knitted material, or any leather article that has been washed and is rid of the mold, must be washed again. Then it will be clean.”

These are the regulations concerning defiling molds in woolen or linen clothing, woven or knitted material, or any leather article, for pronouncing them clean or unclean.