Leviticus 14:49-53

⁴⁹To cleanse the house then, he shall take two birds, cedar wood, a scarlet string, and hyssop, ⁵⁰and he shall slaughter the one bird in an earthenware vessel over running water. ⁵¹Then he shall take the cedar wood, the hyssop, and the scarlet string, with the live bird, and dip them in the blood of the slaughtered bird as well as in the running water, and sprinkle the house seven times. ⁵²So he shall cleanse the house with the blood of the bird and with the running water, along with the live bird, the cedar wood, the hyssop, and the scarlet string. ⁵³However, 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.”