Leviticus 14:44-48

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.

And if the priest shall come in, and look upon it, and, behold, the plague hath not spread in the house, after the house was plaistered: then the priest shall pronounce the house clean, because the plague is healed.