Leviticus 14:1-5

Then the LORD spoke to Moses, saying, “This shall be the law of the leper for the day of his cleansing: He shall be brought to the priest. And the priest shall go out of the camp, and the priest shall examine him; and indeed, if the leprosy is healed in the leper, then the priest shall command to take for him who is to be cleansed two living and clean birds, cedar wood, scarlet, and hyssop. And the priest shall command that one of the birds be killed in an earthen vessel over running water.