Leviticus 14:44 (KJV)

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.