Leviticus 14:4-7

4then shall the priest command to take for him that is to be cleansed two clean living birds, and cedar-wood, and scarlet, and hyssop.

5And the priest shall command that one bird be killed in an earthen vessel over running water:

6as to the living bird — he shall take it, and the cedar-wood, and the scarlet, and the hyssop, and dip them and the living bird in the blood of the bird that was killed over the running water;

7and he shall sprinkle upon him that is to be cleansed from the leprosy seven times, and shall pronounce him clean, and shall let the living bird loose into the open field.