131 The Lord said to Moses and Aaron, 2 "If anyone has a swelling or a rash or discolored skin that might develop into a serious skin disease, that person must be brought to Aaron the priest or to one of his sons. 3 The priest will examine the affected area of the skin. If the hair in the affected area has turned white and the problem appears to be more than skin-deep, it is a serious skin disease, and the priest who examines it must pronounce the person ceremonially unclean. 4 "But if the affected area of the skin is only a white discoloration and does not appear to be more than skin-deep, and if the hair on the spot has not turned white, the priest will quarantine the person for seven days. 5 On the seventh day the priest will make another examination. If he finds the affected area has not changed and the problem has not spread on the skin, the priest will quarantine the person for seven more days. 6 On the seventh day the priest will make another examination. If he finds the affected area has faded and has not spread, the priest will pronounce the person ceremonially clean. It was only a rash. The person's clothing must be washed, and the person will be ceremonially clean. 7 But if the rash continues to spread after the person has been examined by the priest and has been pronounced clean, the infected person must return to be examined again. 8 If the priest finds that the rash has spread, he must pronounce the person ceremonially unclean, for it is indeed a skin disease. 9 "Anyone who develops a serious skin disease must go to the priest for an examination. 10 If the priest finds a white swelling on the skin, and some hair on the spot has turned white, and there is an open sore in the affected area, 11 it is a chronic skin disease, and the priest must pronounce the person ceremonially unclean. In such cases the person need not be quarantined, for it is obvious that the skin is defiled by the disease. 12 "Now suppose the disease has spread all over the person's skin, covering the body from head to foot.
Matthew Henry's Commentary on Leviticus 13:1-12
Commentary on Leviticus 13:1-17
(Read Leviticus 13:1-17)
The plague of leprosy was an uncleanness, rather than a disease. Christ is said to cleanse lepers, not to cure them. Common as the leprosy was among the Hebrews, during and after their residence in Egypt, we have no reason to believe that it was known among them before. Their distressed state and employment in that land must have rendered them liable to disease. But it was a plague often inflicted immediately by the hand of God. Miriam's leprosy, and Gehazi's, and king Uzziah's, were punishments of particular sins; no marvel there was care taken to distinguish it from a common distemper. The judgment of it was referred to the priests. And it was a figure of the moral pollutions of men's minds by sin, which is the leprosy of the soul, defiling to the conscience, and from which Christ alone can cleanse. The priest could only convict the leper, (by the law is the knowledge of sin,) but Christ can cure the sinner, he can take away sin. It is a work of great importance, but of great difficulty, to judge of our spiritual state. We all have cause to suspect ourselves, being conscious of sores and spots; but whether clean or unclean is the question. As there were certain marks by which to know it was leprosy, so there are marks of such as are in the gall of bitterness. The priest must take time in making his judgment. This teaches all, both ministers and people, not to be hasty in censures, nor to judge anything before the time. If some men's sins go before unto judgment, the sins of others follow after, and so do men's good works. If the person suspected were found to be clean, yet he must wash his clothes, because there had been ground for the suspicion. We have need to be washed in the blood of Christ from our spots, though not leprosy spots; for who can say, I am pure from sin?