(7, 8) But if the scab spread.--As Leviticus 13:5 prescribes that the priest who examines the patient after seven days' quarantine, and finds no spreading of the affected spot, is to give another seven days' quarantine, the verses before us declare what the examining priest is to do when he notices that the spot has spread.

For his cleansing.--That is, for the purpose of being declared clean. If, after he had appeared before the priest to be examined and declared not leprous, at the expiration of the first week of seclusion the priest finds that the spot has spread, he must pronounce him unclean, since the spreading indicates that it is leprosy.

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?But if the scab spread much abroad in the skin,.... Or "in spreading spread" (k); spreads, and proceeds to spread more and more:

after that he hath been seen of the priest for his cleansing: even after he had been viewed upon the first presentation of him to him, and after he had been twice seen by him by the end of two weeks, in which he was shut up, and after he had been pronounced clean, and had washed his clothes for his purification:

he shall be seen of the priest again; either he shall go to him of himself, or be brought to him, to be reviewed and pass under afresh examination.

(k) "diffundendo diffuderit se", Montanus, Drusius, Piscator.