The rigidness of the law which excluded lepers from the camp and afterwards from the cities had its necessity in the presumed nature of their disease. Leprosy was regarded as contagious, and practically incurable by any medical appliances, requiring to be kept in check by strenuous measures. Care for the general health meant hardship to the lepers; but this could not be avoided. From friends and home they were sent forth to live together as best they might, and spend what remained of life in almost hopeless separation. The authority of Moses is attached to the statute of exclusion, and there can be no doubt of its great antiquity. In Leviticus there are detailed enactments regarding the disease, some of which contemplate its decay and provide for the restoration to privilege of those who had been cured. The ceremonies were complicated, and among them were sacrifices to be offered by way of "atonement." The leper was alienated from God, severed from the congregation as one guilty in the eye of the law (Lev. xiv. 12); and there can be no wonder that with this among other facts before him the writer of the Epistle to the Hebrews speaks of the law as having a mere "shadow of the good things to come."
And yet, in view of the malignant nature of the disease and the peril it caused to the general health, we must admit the wisdom of segregating those afflicted with leprosy. That Israel might be a robust people capable of its destiny, a rule like this was needful. It anticipated our modern laws made in harmony with advanced medical science, which require segregation or isolation in cases of virulent disease.
It has been affirmed that leprosy was from the first regarded as symbolic of moral disease, and that the legislation was from this point of view. There is, however, no evidence to support the theory. Indeed the conception of moral evil would have been confused rather than helped by any such idea. For although evil habits taint the mind and vice ruins it as leprosy taints and destroys the body; although the infectious nature of sin is fitly indicated by the insidious spread of this disease--one point in which there is no resemblance would make the symbol dangerously misleading. A few here and there were attacked by leprosy, and these with their blotched disfigured bodies were easily distinguished from the healthy. But this was in contrast with the secret moral malady by which all were tainted. The teaching that leprosy is a type of sin would make, not for morality, but for hypocrisy. The symptoms of a bad nature, like the signs of leprosy, would be looked for and found by every man in his neighbour, not in his own heart. The hypocrite would be encouraged in his self-satisfaction because he escaped the judgment of his fellow men. But the disease of sin is endemic, universal. The whole congregation was by reason of that excluded from the sanctuary of God.