Leviticus 14:4-7

ISV(i) 4 If he has been healed, then the priest is to command that two live and clean birds, some cedar wood, some crimson thread, and hyssop be brought for the one cleansed. 5 Then the priest is to command that one bird be slaughtered on an earthen vessel over flowing water. 6 He is to take the live bird, the cedar wood, the crimson thread, and the hyssop, and dip them together in the blood of the bird that had been slaughtered over the flowing water. 7 He is to sprinkle the blood seven times on the person with the infectious skin disease and then pronounce him clean. Then he is to release the live bird into the open fields.