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.

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 in the place of the boil there be a white rising,.... In the place where the boil was, a white swelling appears:

or a bright spot, white, and somewhat reddish; white and red mixed, as the Targum of Jonathan; and so Aben Ezra interprets the word "reddish", of the bright spot being mixed of two colours, or part of it so; and such a mixed colour of white and red, Gersom observes, is usual in a swelling, and adds, we are taught how to judge of these appearances, according to a tradition from Moses, which is this: take a cup full of milk, and put in it two drops of blood, and the colour of it will be as the colour of the bright spot, white and reddish; and if you put into it four drops, its colour will be as the colour of the rising (or swelling) reddish; and if you put into it eight drops, its colour will be as the colour of the scab of the bright spot, more reddish; and if you put into it sixteen drops, its colour will be as the colour of the scab of the swelling, very red: hence it appears, says he, that the bright spot is whitest with its redness, and after that the swelling, and next the scab of the bright spot, and then the scab of the swelling; but Bochart (p) is of opinion that the word is wrongly rendered "reddish", which, he thinks, contradicts the account of the bright spot being white, and especially as the word for "reddish" has its radicals doubled, which always increase the signification; and therefore if the word bears the sense of redness, it should be rendered "exceeding red", which would be quite contrary to the spot being white at all; wherefore from the use of the word in the Arabic language, which signifies white, bright, and glittering; See Gill on Lam 4:7; he chooses to read the words, "or a bright spot, white and exceeding glittering": but this word we render reddish and white, being read disjunctively, Lev 13:24; seems to contradict this observation of his:

and it be shewed to the priest; to look upon and pass his judgment on it.

(p) Hierozoic. par. 2. l. 5. c. 6. col. 689.

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.