Leviticus 13:20

a skin disease: The Hebrew word tsaraʿat refers to more than Hansen’s disease (leprosy), which is rare and severely disfiguring. In Leviticus, the word describes many different conditions. These include:

• an open sore (13:10),

• a boil (13:18),

• a burn (13:24),

• a sore on the head or chin (13:29),

• shiny white patches (13:38), or

• unusual baldness (13:40).

A key test was whether the condition spread to other parts of the body (13:5–8). If it did, they quarantined the person while the disorder lasted (13:46). Not only people, but also clothing and even buildings could become infected (13:47–59; 14:33–53).

if the rising be white--This BRIGHT WHITE leprosy is the most malignant and inveterate of all the varieties the disease exhibits, and it was marked by the following distinctive signs: A glossy white and spreading scale, upon an elevated base, the elevation depressed in the middle, but without a change of color; the black hair on the patches participating in the whiteness, and the scaly patches themselves perpetually enlarging their boundary. Several of these characteristics, taken separately, belong to other blemishes of the skin as well; so that none of them was to be taken alone, and it was only when the whole of them concurred that the Jewish priest, in his capacity of physician, was to pronounce the disease a malignant leprosy. If it spread over the entire frame without producing any ulceration, it lost its contagious power by degrees; or, in other words, it ran through its course and exhausted itself. In that case, there being no longer any fear of further evil, either to the individual himself or to the community, the patient was declared clean by the priest, while the dry scales were yet upon him, and restored to society. If, on the contrary, the patches ulcerated and quick or fungous flesh sprang up in them, the purulent matter of which, if brought into contact with the skin of other persons, would be taken into the constitution by means of absorbent vessels, the priest was at once to pronounce it an inveterate leprosy. A temporary confinement was them declared to be totally unnecessary, and he was regarded as unclean for life [DR. GOOD]. Other skin affections, which had a tendency to terminate in leprosy, though they were not decided symptoms when alone, were: "a boil" (Lev 13:18-23); "a hot burning,"--that is, a fiery inflammation or carbuncle (Lev 13:24-28); and "a dry scall" (Lev 13:29-37), when the leprosy was distinguished by being deeper than the skin and the hair became thin and yellow.

The priest is here instructed what judgment to make if there was any appearance of a leprosy, either, 1. In an old ulcer, or bile, that has been healed, Lev 13:18, etc. When old sores, that seemed to be cured, break out again, it is to be feared there is a leprosy in them; such is the danger of those who, having escaped the pollutions of the world, are again entangled therein and overcome. Or, 2. In a burn by accident, for this seems to be meant, Lev 13:24, etc. The burning of strife and contention often proves the occasion of the rising up and breaking out of that corruption which witnesses to men's faces that they are unclean. 3. In a scall-head. And in this commonly the judgment turned upon a very small matter. If the hair in the scall was black, it was a sign of soundness; if yellow, it was an indication of a leprosy, Lev 13:30-37. The other rules in these cases are the same with those mentioned before. In reading of these several sorts of ailments, it will be good for us, 1. To lament the calamitous state of human life, which lies exposed to so many grievances. What troops of diseases are we beset with on every side! and they all entered by sin. 2. To give thanks to God if he has never afflicted us with any of these sores: if the constitution is healthful, and the body lively and easy, we are bound to glorify God with our bodies.

When a man shall have in the skin. Since every eruption was not the leprosy, and did not render a man unclean, when God appoints the priests to be the judges, He distinguishes by certain marks a common eruption from the leprosy; and then subjoins the difference between the various kinds of leprosy. For the disease was not always incurable; but, only when the blood was altogether corrupted, so that the skin itself had become hardened by its corrosion, or swollen by its diseased state. This, then, must be observed in the first place, that the Greek and Latin word lepra, and the Hebrew tsrt tzaragmath, extend further than to the incurable disease, which medical men call elephantiasis [4] both on account of the hardness of the skin, and also its mottled color; not, however, that there is an entire agreement between the thickness of the man's skin and that of an elephant, but because this disease produces insensibility of the skin. This the Greeks call Psora, and if it be not a kind of leprosy, it is nearly allied to it. Thus we see that there was a distinction between the scab and leprosy; just as now-a-days, if it were necessary to judge respecting the itch, (which is commonly called the disease of St. Menanus, [5] the marks must be observed, which distinguish it from leprosy. But, as to the various kinds of leprosy, I confess that I am not a physician, so as to discuss them accurately, and I purposely abstain from close inquiry about them, because I am persuaded that the disease here treated of affected the Israelites in an extraordinary manner, which we are now unacquainted with; for what do we now know of a leprous house? Indeed it is probable that, since heathen writers knew that the Jewish people suffered from this disease, they laid hold of it as the ground of their falsehood, that all the descendants of Abraham were infected with the itch, and were driven away from Egypt, lest others should catch it from them. That [6] this was an ancient calumny appears from Josephus, both in the ninth book of his Antiquities, and in his Treatise against Apion; and it is repeated both by C. Tacitus and Justin. Yet I make no doubt that the Egyptians, a very proud nation, in order to efface the memory of their own disgrace, and of the vengeance inflicted upon them by God, invented this lie, and thus grossly turned against this innocent people what had happened to themselves, when they were smitten with boils and blains. But we shall see hereafter, amongst God's curses, that He chastised His people with the same plagues as He had inflicted on the Egyptians:

"The Lord will smite thee with the botch of Egypt, and with the emerods, and with the scab," etc. (Deuteronomy 28:27.)

Whence it may be probably inferred, that God avenged the crimes of His ancient people with special judgments, which are now unknown to us; just as afterwards new diseases arose, from which those in old times were free. At any rate, Josephus, by clear and solid arguments, exposes the absurdity of this accusation, that Moses was driven from Egypt with a crowd of exiles, lest they should infect the country with their disease; because, if they had been universally affected with this malady, he never would have imposed such severe laws for separating the lepers from general society.

God first commands that, whenever a suspicion of leprosy arose, the man was to present himself to the priest; if any symptom of leprosy appeared, He commands him to be shut up for a period of seven days, until it should appear from the progress of the disease that it was incurable leprosy. That God should have appointed the priests to be judges, and those, too, only of the highest order, is a proof that His spiritual service was rather regarded than mere bodily health. If any shall inquire whether leprosy is not a contagious disease, and whether it be not therefore expedient that all who were affected by it should be removed from intercourse with others, I admit, indeed, that such is the case, but I deny that this was the main object in view. For, in process of time, physicians would have been better able to decide by their art and skill: whereas God enjoined this decision upon the priests alone, and gave them the rule whereby they were to judge. Nor did He appoint the Levites indiscriminately, but only the sons of Aaron, who were the highest order, in order that the authority of the decision might be greater. It was, then, by a gross error, or rather impudence, that the Papal priests (sacrifici) assumed to themselves this jurisdiction. It was (they say) the office of the chief priests under the Law to distinguish between the kinds of leprosy; and, therefore, the same right is transferred to the bishops. But they carry the mockery still further: the official [7] the bishop's representative, sits as the legitimate judge; he calls in physicians and surgeons, from whose answers he pronounces what he confesses he is ignorant of himself. Behold how cleverly they accommodate a legal rite to our times! The mockery, however, is still more disgusting, when in another sense they extend to the whole tribe of priests what they have said to belong solely to the bishops; for, since the sin under which all labor is a spiritual leprosy, they thence infer that all are excluded from the congregation of the faithful until they shall have been purged and received by absolution, which they hold to be the common office of all the priests. They afterwards add, that judgment cannot be pronounced till the cause is heard, and so conclude that confession is necessary. But, if they choose to have recourse to subtleties, reason would rather conduct us to the opposite conclusion; for God did not desire the priests to take cognizance of a hidden disease, but only after the manifest symptoms had appeared: hence it will follow, that it is preposterous to bring secret sins to judgment, and that wretched men are dragged to their confession contrary to all law and justice. But, setting aside all these absurdities, an analogy must be observed between us and God's ancient people. He of old forbade the external uncleanness of the flesh to be tolerated in His people. By Christ's coming, the typical. figure has ceased; but we are taught that all uncleanness, whereby the purity of His services is defiled, is not to be cherished, or borne with amongst us. And surely excommunication answers to this ceremony; since by it the Church is purified, lest corruptions should everywhere assail it, if wicked and guilty persons occupied a place in it promiscuously with the good. The command of God that, whilst the disease was obscure and questionable, the infected person should be shut up for seven days, recommends moderation to us, lest any, who is still curable, should be condemned before his time. In fact, this medium is to be observed, that the judge should not be too remiss and hasty in pardoning, and still that he should temper severity by justice; and especially that he should not be too precipitate in his judgment. What we translate "shall pronounce him clean, or unclean," is in Hebrew, "shall clean, or unclean him;" thus the dignity of the judgment is more fully established, as though it had proceeded from God Himself; and assuredly no medical skill could declare on the seventh day a leprosy to be incurable, respecting which there was doubt so short a time before, unless God should in some special manner discover the uncleanness, and guide the eyes of the priests by His Spirit.

In the skin thereof, was a boil - Scheuchzer supposes this and the following verse to speak of phlegmonic, erysipelatous, gangrenous, and phagedenic ulcers, all of which were subjected to the examination of the priest, to see whether they were infectious, or whether the leprosy might not take its origin from them. A person with any sore or disposition to contagion was more likely to catch the infection by contact with the diseased person, than he was whose skin was whole and sound, and his habit good.

And if, when the priest seeth it,.... And has thoroughly viewed it and considered it:

behold, it be in sight lower than the skin; having eaten into and taken root in the flesh under the skin:

and the hair thereof be turned white; which are the signs of leprosy before given, Leviticus 13:3,

the priest shall pronounce him unclean; not fit for company and conversation, but obliged to conform to the laws concerning leprosy:

it is a plague of leprosy broken out of the boil; which was there before: this is an emblem of apostates and apostasy, who having been seemingly healed and cleansed, return to their former course of life, and to all the impurity of it, like the dog to its vomit, and the swine to its wallowing in the mire, Proverbs 26:11; and so their last state is worse than the first, Matthew 12:45, as in this case; at first it was a boil, and then thought to be cured, and afterwards arises out of it a plague of leprosy.

The symptoms of leprosy, whether proceeding directly from eruptions in the skin, or caused by a boil or burn. - Lev 13:2-8. The first case: "When a man shall have in the skin of his flesh (body) a raised spot or scab, or a bright spot." שׂאת, a lifting up (Gen 4:7, etc.), signifies here an elevation of the skin in some part of the body, a raised spot like a pimple. ספּחת, an eruption, scurf, or scab, from ספח to pour out, "a pouring out as it were from the flesh or skin" (Knobel). בּהרת .)le, from בּהר, in the Arabic and Chaldee to shine, is a bright swollen spot in the skin. If ether of these signs became "a spot of leprosy," the person affected was to be brought to the priest, that he might examine the complaint. The term zaraath, from an Arabic word signifying to strike down or scourge, is applied to leprosy as a scourge of God, and in the case of men it always denotes the white leprosy, which the Arabs call baras. נגע, a stroke (lit., "stroke of leprosy"), is applied not only to the spot attacked by the leprosy, the leprous mole (Lev 13:3, Lev 13:29-32, Lev 13:42, etc.), but to the persons and even to things affected with leprosy (Lev 13:4, Lev 13:12, Lev 13:13, Lev 13:31, Lev 13:50, Lev 13:55).
Lev 13:3
A person so diseased was to be pronounced unclean, (a) if the hair of his head had turned white on the mole, i.e., if the dark hair which distinguished the Israelites had become white; and (b) if the appearance of the mole was deeper than the skin of the flesh, i.e., if the spot, where the mole was, appeared depressed in comparison with the rest of the skin. In that case it was leprosy. These signs are recognised by modern observers (e.g., Hensler); and among the Arabs leprosy is regarded as curable if the hair remains black upon the white spots, but incurable if it becomes whitish in colour.
Lev 13:4-6
But if the bright spot was white upon the skin, and its appearance was not deeper than the skin, and the place therefore was not sunken, nor the hair turned white, the priest was to shut up the leper, i.e., preclude him from intercourse with other men, for seven days, and on the seventh day examine him again. If he then found that the mole still stood, i.e., remained unaltered, "in his eyes," or in his view, that it had not spread any further, he was to shut him up for seven days more. And if, on further examination upon the seventh day, he found that the mole had become paler, had lost its brilliant whiteness, and had not spread, he was to declare him clean, for it was a scurf, i.e., a mere skin eruption, and not true leprosy. The person who had been pronounced clean, however, was to wash his clothes, to change himself from even the appearance of leprosy, and then to be clean.
Lev 13:7-8
But if the scurf had spread upon the skin "after his (first) appearance before the priest with reference to his cleansing," i.e., to be examined concerning his purification; and if the priest notice this on his second appearance, he was to declare him unclean, for in that case it was leprosy.
Lev 13:9-17
The second case (Lev 13:9-17): if the leprosy broke out without previous eruptions.
Lev 13:9-11
"If a mole of leprosy is in a man, and the priest to whom he is brought sees that there is a white rising in the skin, and this has turned the hair white, and there is raw (proud) flesh upon the elevation, it is an old leprosy." The apodosis to Lev 13:9 and Lev 13:10 commences with Lev 13:11. חי בּשׂר living, i.e., raw, proud flesh. מחיה the preservation of life (Gen 45:5), sustenance (Jdg 6:4); here, in Lev 13:10 and Lev 13:24, it signifies life in the sense of that which shows life, not a blow or spot (נגע, from מחה to strike), as it is only in a geographical sense that the verb has this signification, viz., to strike against, or reach as far as (Num 34:11). If the priest found that the evil was an old, long-standing leprosy, he was to pronounce the man unclean, and not first of all to shut him up, as there was no longer any doubt about the matter.
Lev 13:12-13
If, on the other hand, the leprosy broke out blooming on the skin, and covered the whole of the skin from head to foot "with regard to the whole sight of the eyes of the priest," i.e., as far as his eyes could see, the priest was to pronounce the person clean. "He has turned quite white," i.e., his dark body has all become white. The breaking out of the leprous matter in this complete and rapid way upon the surface of the whole body was the crisis of the disease; the diseased matter turned into a scurf, which died away and then fell off.
Lev 13:14-19
"But in the day when proud flesh appears upon him, he is unclean,...the proud flesh is unclean; it is leprosy." That is to say, if proud flesh appeared after the body had been covered with a white scurf, with which the diseased matter had apparently exhausted itself, the disease was not removed, and the person affected with it was to be pronounced unclean.
The third case: if the leprosy proceeded from an abscess which had been cured. In Lev 13:18 בּשׂר is first of all used absolutely, and then resumed with בּו, and the latter again is more closely defined in בּעורו: "if there arises in the flesh, in him, in his skin, an abscess, and (it) is healed, and there arises in the place of the abscess a white elevation, or a spot of a reddish white, he (the person so affected) shall appear at the priest's."
Lev 13:20
If the priest found the appearance of the diseased spot lower than the surrounding skin, and the hair upon it turned white, he was to pronounce the person unclean. "It is a mole of leprosy: it has broken out upon the abscess."
Lev 13:21-23
But if the hair had not turned white upon the spot, and there was no depression on the skin, and it (the spot) was pale, the priest was to shut him up for seven days. If the mole spread upon the skin during this period, it was leprosy; but if the spot stood in its place, and had not spread, it was השּׁחין צרבת, "the closing of the abscess:" literally "the burning;" here, that part of the skin or flesh which has been burnt up or killed by the inflammation or abscess, and gradually falls off as scurf (Knobel).
Lev 13:24-28
The fourth case (Lev 13:24-28): if there was a burnt place upon the skin of the flesh (מבות־אשׁ, a spot where he had burnt himself with fire, the scar of a burn), and the "life of the scar" - i.e., the skin growing or forming upon the scar (see Lev 13:10), - "becomes a whitish red, or white spot," i.e., if it formed itself into a bright swollen spot. This was to be treated exactly like the previous case. המּכוה שׂאת (Lev 13:28), rising of the scar of the burn, i.e., a rising of the flesh and skin growing out of the scar of the burn.