Leviticus 14:46-50

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.

And he shall take to cleanse the house two birds, and cedar wood, and scarlet, and hyssop:

And he shall kill the one of the birds in an earthen vessel over running water: