Leviticus 14:48-53

“But if the priest comes in and inspects it and the mark has not spread in the house after the house has been replastered, he shall pronounce the house clean because the mark has not reappeared. To cleanse the house then, he shall take two birds and cedar wood and scarlet string and hyssop; and he shall kill one of the birds in an earthenware container over running water, and he shall take the cedar wood and the hyssop and the scarlet string, and the living bird, and dip them in the blood of the slain bird as well as in the running water, and sprinkle the house seven times. So he shall cleanse the house with the blood of the bird and with the running water, along with the live bird and the cedar wood and the hyssop and the scarlet string. But he shall let the live bird go free outside the city into the open field. So he shall make atonement for the house, and it will be clean.”