(15) And the priest shall make an atonement.--That is, for the sinful act which has brought about the infirmity. The severity with which people were treated who had contracted this disease may further be seen from the fact that they had to remain without the camp (Numbers 5:1-4). During the second Temple they were debarred from partaking of the Paschal meal, and were banished from the precincts of the holy city. Hence, when David in his great indignation wanted to invoke an imprecation upon his adversaries, he exclaimed "Let there not fail from the house of Joab one that hath an issue" (2Samuel 3:29).

15:1-33 Laws concerning ceremonial uncleanness. - We need not be curious in explaining these laws; but have reason to be thankful that we need fear no defilement, except that of sin, nor need ceremonial and burdensome purifications. These laws remind us that God sees all things, even those which escape the notice of men. The great gospel duties of faith and repentance are here signified, and the great gospel privileges of the application of Christ's blood to our souls for our justification, and his grace for our sanctification.And the priest shall offer them, the one for a sin offering, and the other for a burnt offering,.... As in the case of a new mother who is poor, and of a poor leper, Leviticus 12:8,

and the priest shall make atonement for him before the Lord for his issue; which, though not in itself sinful, yet might be occasioned by sin, for which the atonement was made: or, however, it was a ceremonial uncleanness, and therefore a ceremonial expiation must he made for it, typical of the atonement by the blood and sacrifice of Christ, by which all kinds of sin is expiated and removed.