Leviticus 14:2-5

2"This shall be the law of the leprous person for the day of his cleansing. He shall be brought to the priest,

3and the priest shall go out of the camp, and the priest shall look. Then, if the case of leprous disease is healed in the leprous person,

4the priest shall command them to take for him who is to be cleansed two live clean birds and cedarwood and scarlet yarn and hyssop.

5And the priest shall command them to kill one of the birds in an earthenware vessel over fresh water.