Leviticus 14:1-9

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. The priest will order that one bird be slaughtered over a clay pot filled with fresh water. He will take the live bird, the cedar stick, the scarlet yarn, and the hyssop branch, and dip them into the blood of the bird that was slaughtered over the fresh water. The priest will then sprinkle the blood of the dead bird seven times on the person being purified of the skin disease. When the priest has purified the person, he will release the live bird in the open field to fly away. “The persons being purified must then wash their clothes, shave off all their hair, and bathe themselves in water. Then they will be ceremonially clean and may return to the camp. However, they must remain outside their tents for seven days. On the seventh day they must again shave all the hair from their heads, including the hair of the beard and eyebrows. They must also wash their clothes and bathe themselves in water. Then they will be ceremonially clean.