When the plague of leprosy is in a man,.... He has all the signs of it, and it is pretty manifest both to himself and others that it is upon him:
then he shall be brought unto the priest; by his friends and neighbours, if he is not willing to come of himself: a sinner insensible of the leprosy of sin, and of his unclean and miserable state through it, has no will to come to Christ the great High Priest for cleansing; but one that is sensible of it, and of Christ's ability to help and cleanse him, will come freely and gladly, and importunately seek to him for it; though indeed such an one is brought by powerful and efficacious grace to him, yet not against, but with his full will; see John 5:40; compare with this Matthew 8:1.

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" (Leviticus 13:18-23); "a hot burning,"--that is, a fiery inflammation or carbuncle (Leviticus 13:24-28); and "a dry scall" (Leviticus 13:29-37), when the leprosy was distinguished by being deeper than the skin and the hair became thin and yellow.