* * * * *
The chapter before us calls for little detailed exposition. The diagnosis of the disease by the priest is treated under four different heads: (1) the case of a leprosy rising spontaneously (vv. 1-17, 38, 39); (2) leprosy rising out of a boil (vv. 18-24); (3) rising out of a burn (vv. 24-28); (4) leprosy on the head or beard (vv. 29-37, 40-44). The indications which are to be noted are described (vv. 2, 3, 24-27, etc.) as a rising of the surface, a scab (or scale), or a bright spot (very characteristic), the presence in the spot of hair turned white, the disease apparently deeper than the outer or scarf skin, a reddish-white colour of the surface, and a tendency to spread. The presence of "raw flesh" is mentioned (ver. 10) as an indication of a leprosy already somewhat advanced, "an old leprosy." In cases of doubt, the suspected case is to be isolated for a period of seven or, if need be, fourteen days, at the expiration of which the priest's verdict is to be given, as the symptoms may then indicate.
Two cases are mentioned which the priest is not to regard as leprosy. The first (vv. 12, 13) is that in which the plague "covers all the skin of him that hath the plagues from his head even to his feet, as far as appeareth to the priest," so that he "is all turned white." At first thought, this seems quite unaccountable, seeing that leprosy finally affects the whole body. But the solution of the difficulty is not far to seek. For the next verse provides that, in such a case, if "raw flesh" appear, he shall be held to be unclean. The explanation of this provision of ver. 12 is therefore apparently this: that if an eruption had so spread as to cover the whole body, turning it white, and yet no raw flesh had appeared in any place, the disease could not be true leprosy; as, if it were, then, by the time that it had so extended, "raw flesh" would certainly have appeared somewhere. The disease indicated by this exception was indeed well known to the ancients, as it is also to the moderns as the "dry tetter;" which, although an affection often of long duration, frequently disappears spontaneously, and is never malignant.
The second case which is specified as not to be mistaken for leprosy is mentioned in vv. 38, 39, where it is described as marked by bright spots of a dull whiteness, but without the white hair, and other characteristic signs of leprosy. The Hebrew word by which it is designated is rendered in the Revised Version "tetter;" and the disease, a non-malignant tetter or _eczema_, is still known in the East under the same name (_bohak_) which is here used.
Verses 45, 46, give the law for him who has been by the priest adjudged to be a leper. He must go with clothes rent, with his hair neglected, his lip covered, crying, "Unclean! unclean!" without the camp, and there abide alone for so long as he continues to be afflicted with the disease. In other words, he is to assume all the ordinary signs of mourning for the dead; he is to regard himself, and all others are to regard him, as a dead man. As it were, he is a continual mourner at his own funeral.
Wherein lay the reason for this law? One might answer, in general, that the extreme loathsomeness of the disease, which made the presence of those who had it to be abhorrent even to their nearest friends, would of itself make it only fitting, however distressing might be the necessity, that such persons should be excluded from every possibility of appearing, in their revolting corruption, in the sacred and pure precincts of the tabernacle of the holy God, as also from mingling with His people. Many, however, have seen in the regulation only a wise law of public hygiene. That a sanitary intent may very probably have been included in the purpose of this law, we are by no means inclined to deny. In earlier times, and all through the middle ages, the disease was regarded as contagious; and lepers were accordingly segregated, as far as practicable, from the people. In modern times, the weight of opinion until recent years has been against this older view; but the tendency of medical authority now appears to be to reaffirm the older belief. The alarming increase of this horrible disease in all parts of the world, of late, following upon a general relaxation of those precautions against contagion which were formerly thought necessary, certainly supports this judgment; and it may thus be easily believed that there was just sanitary ground for the rigid regulations of the Mosaic code. And just here it may be remarked, that if indeed there be any degree of contagiousness, however small, in this plague, no one who has ever seen the disease, or understands anything of its incomparable horror and loathsomeness, will feel that there is any force in the objections which have been taken to this part of the Mosaic law as of inhuman harshness toward the sufferers. Even were the risk of contagion but small, as it probably is, still, so terrible is the disease that one would more justly say that the only inhumanity were to allow those afflicted with it unrestricted intercourse with their fellow-men. The truth is, that the Mosaic law concerning the treatment of the leper, when compared with regulations touching lepers which have prevailed among other nations, stands contrasted with them by its comparative leniency. The Hindoo law, as is well known, even insists that the leper ought to put himself out of existence, requiring that he shall be buried alive.