Leviticus 14:5-7

⁵And the priest shall give direction, and they shall kill one bird over an earthen vessel over running water.

⁶And as for the living bird he shall take it, and the cedar wood, and the spun scarlet, and the hyssop, and he shall dip them and the living bird into the blood of the bird that was slain over running water.

⁷And he shall sprinkle seven times upon him that was cleansed of his leprosy, and he shall be clean; and he shall let go the living bird into the field.