Leviticus 14:4-6, 49-52

then the priest shall give orders to take two live clean birds and cedar wood and scarlet string and hyssop for the one to be cleansed. [Heb 9:19-22] Next the priest shall order that one of the birds be killed [as a sacrifice] in an earthenware container over [fresh] running water. As for the live bird, he shall take it together with the cedar wood and the scarlet string and the hyssop, and shall dip them and the live bird in the blood of the bird sacrificed over the running water.

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.