Leviticus 14:4-7

4then the kohen is to command that two clean living birds, cedar wood, scarlet and hyssop be brought for the one being cleansed.

5The kohen shall command them to kill one of the birds in a clay pot over living water.

6As for the living bird, he is to take it, the cedar wood, the scarlet and the hyssop, and dip them with the living bird into the blood of the bird that was killed over the living water.

7He is to sprinkle on the one being cleansed from the tza'arat seven times and pronounce him clean, then release the living bird over the open field.