Leviticus 14:2-5

2This shall be the law of the leper in the day of his cleansing: he shall be brought unto the priest:

3and the priest shall go forth out of the camp; and the priest shall look; and, behold, if the plague of leprosy be healed in the leper,

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

5and the priest shall command to kill one of the birds in an earthen vessel over running water.