Leviticus 14:5-7

⁵And the priest shall direct that one of the birds be killed in an earthen vessel with spring water.

⁶And he shall take the living bird with the cedar wood, and the scarlet, and the hyssop, and dip them and the living bird in the blood of the bird that had been killed over the spring water.

⁷And he shall sprinkle it on him who is to be cleansed form leprosy seven times, and he shall be clean: and the living bird he shall send forth upon the face of the field.