Leviticus 13:29–37

²⁹“When a man or a woman gets a sore on the scalp or on the chin, ³⁰a priest must look at the sore. If it seems deeper than the skin and the hair around it is thin and yellow, the priest must announce that the person is unclean. It is an itch, a harmful skin disease of the head or chin. ³¹But if the priest looks at it and it does not seem deeper than the skin and there is no black hair in it, the priest must separate the person from other people for seven days. ³²On the seventh day the priest must look at the sore. If it has not spread, and there are no yellow hairs growing in it, and the sore does not seem deeper than the skin, ³³the person must shave himself, but he must not shave the sore place. The priest must separate that person from other people for seven more days. ³⁴On the seventh day the priest must look at the sore. If it has not spread on the skin and it does not seem deeper than the skin, the priest must announce that the person is clean. So the person must wash his clothes and become clean. ³⁵But if the sore spreads on the skin after the person has become clean, ³⁶the priest must look at him again. If the sore has spread on the skin, the priest doesn’t need to look for the yellowish hair; the person is unclean. ³⁷But if the priest thinks the sore has stopped spreading, and black hair is growing in it, the sore has healed. The person is clean, and the priest must announce that he is clean.