Leviticus 14:1-4

And the LORD said to Moses, “The following instructions are for those seeking ceremonial purification from a skin disease. Those who have been healed must be brought to the priest, who will examine them at a place outside the camp. If the priest finds that someone has been healed of a serious skin disease, he will perform a purification ceremony, using two live birds that are ceremonially clean, a stick of cedar, some scarlet yarn, and a hyssop branch.