Leviticus 14:6-7

6As for the live bird, he shall take it together with 1the cedar wood, the 2scarlet string, and the 3hyssop, and shall dip them and the live bird in the blood of the bird that was slaughtered over the 4running water.

75He shall then sprinkle seven times the one who is to be cleansed from the leprosy and shall pronounce him clean, and shall let the live bird go free over the open field.