(12, 13) And if a leprosy break out abroad.--There were, however, two phases of this returned distemper which exempted the patient from uncleanness. If the leprosy suddenly covered the whole body so that the patient became perfectly white, in which case there could be no appearance of live flesh, then he was clean. This indicated the crisis, as the whole evil matter thus brought to the surface formed itself into a scale, which dried and peeled off.

Verses 12-17. - If a leprosy break out abroad... and cover all the skin. There was a form of disease similar to true leprosy, and bearing the name of leprosy, and by some thought to be the final phase of true leprosy, which was yet not to cause legal uncleanness. It was distinguishable from the leprosy which caused uncleanness by a diffusion of the white flakes over the whole body, and by the absence of any patches bearing the appearance of raw flesh (verses 12, 13). Real leprosy might pass into this harmless kind or phase, and it was known to have done so as soon as the raw patches of flesh had disappeared (verses 16, 17). When this had taken place, the priest pronounced him clean.

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?And if a leprosy break out abroad in the skin,.... Or, if flowering it flowers (m); the man that has it on him looks like a plant or tree covered with white flowers, being spread all over him in white swellings, bright spots or scabs, as it follows:

and the leprosy cover all the skin of him that hath the plague, from his head even to his foot; such an one as the leper was that came to Christ for healing, said to be full of leprosy, Luke 5:12; and such in a mystical sense is every sinner, whether sensible of it or not, even from the Crown of the head to the sole of the foot, full of the wounds, bruises, and putrefying sores of sin, Isaiah 1:6,

wheresoever the priest looketh; that is, he cannot look any where upon any part of him but he sees the signs of the leprosy on him; and from whence the Jewish writers gather, that a priest that inspects leprous persons ought to have a clear sight, and to have both his eyes, and that the inspection should not be made in a dark house.

(m) , Sept. "florendo floruerit", Montanus; so Drusius & Tigurine version.