29 “When a man or woman has a plague on the head or on the beard, 30 then the priest shall examine the plague; and behold, if its appearance is deeper than the skin, and the hair in it is yellow and thin, then the priest shall pronounce him unclean: it is an itch, it is leprosy of the head or of the beard. 31 If the priest examines the plague of itching, and behold, its appearance isn’t deeper than the skin, and there is no black hair in it, then the priest shall isolate him the person infected with itching seven days. 32 On the seventh day the priest shall examine the plague; and behold, if the itch hasn’t spread, and there is no yellow hair in it, and the appearance of the itch isn’t deeper than the skin, 33 then he shall be shaved, but he shall not shave the itch; and the priest shall shut him up who has the itch seven more days. 34 On the seventh day, the priest shall examine the itch; and behold, if the itch hasn’t spread in the skin, and its appearance isn’t deeper than the skin, then the priest shall pronounce him clean. He shall wash his clothes, and be clean. 35 But if the itch spreads in the skin after his cleansing, 36 then the priest shall examine him; and behold, if the itch has spread in the skin, the priest shall not look for the yellow hair; he is unclean. 37 But if in his eyes the itch is arrested, and black hair has grown in it; the itch is healed, he is clean. The priest shall pronounce him clean.

Matthew Henry's Commentary on Leviticus 13:29-37

Commentary on Leviticus 13:18-44

(Read Leviticus 13:18-44)

The priest is told what judgment to make, if there were any appearance of a leprosy in old sores; and such is the danger of those who having escaped the pollutions of the world are again entangled therein. Or, in a burn by accident, verse 24. The burning of strife and contention often occasions the rising and breaking out of that corruption, which proves that men are unclean. Human life lies exposed to many grievances. With what troops of diseases are we beset on every side; and thy all entered by sin! If the constitution be healthy, and the body lively and easy, we are bound to glorify God with our bodies. Particular note was taken of the leprosy, if in the head. If the leprosy of sin has seized the head; if the judgment be corrupted, and wicked principles, which support wicked practices, are embraced, it is utter uncleanness, from which few are cleansed. Soundness in the faith keeps leprosy from the head.