Leviticus 14:4-6, 49-52

the priest will command that two living, clean birds, a piece of cedar wood, a piece of red string, and a hyssop plant be brought for cleansing the person with the skin disease. “The priest must order one bird to be killed in a clay bowl containing fresh water. Then he will take the living bird, the piece of cedar wood, the red string, and the hyssop; all these he will dip into the blood of the bird that was killed over the fresh water.

“Then, to make the house clean, the priest must take two birds, a piece of cedar wood, a piece of red string, and a hyssop plant. He will kill one bird in a clay bowl containing fresh water. Then he will take the bird that is still alive, the cedar wood, the hyssop, and the red string, and he will dip them into the blood of the bird that was killed over the fresh water. The priest will sprinkle the blood on the house seven times. He will use the bird’s blood, the fresh water, the live bird, the cedar wood, the hyssop, and the red string to make the house clean.