Leviticus 13:29–37

²⁹And if a man or a woman have a sore on the head or on the beard, ³⁰and the priest look on the sore, and behold, it looketh deeper than the skin, and there is in it yellow thin hair, then the priest shall pronounce him unclean; it is a scall, the leprosy of the head or the beard. ³¹And if the priest look on the sore of the scall, and behold, it is not in sight deeper than the skin, and there is no black hair in it, the priest shall shut up him that hath the sore of the scall seven days. ³²And when the priest looketh on the sore on the seventh day, and behold, the scall hath not spread, and there is in it no yellow hair, and the scall doth not look deeper than the skin, ³³he that hath the sore shall shave himself; but the scall shall he not shave; and the priest shall shut up him that hath the scall seven days a second time. ³⁴And the priest shall look on the scall on the seventh day, and behold, the scall hath not spread in the skin, nor is in sight deeper than the skin, then the priest shall pronounce him clean; and he shall wash his garments, and be clean. ³⁵But if the scall have spread much in the skin after his cleansing, ³⁶and the priest shall look on him, and behold, the scall hath spread in the skin, the priest shall not seek for yellow hair: he is unclean. ³⁷But if the scall have in his sight remained as it was, and there is black hair grown up therein, the scall is healed: he is clean; and the priest shall pronounce him clean.