This chapter would seem to take its place more naturally before Leviticus 12:1-8, with the subject of which it is inmediately connected. Compare especially Leviticus 12:2 with Leviticus 15:19. It stands here between two chapters, with neither of which has it any close connection.

And the Lord spake unto Moses, and unto Aaron,.... Aaron is spoken to as well Moses, because some of these purifications, after mentioned, depended on the priest, as the affair of profluvious men and women, as Gersom observes:
saying;
as follows.

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.

The Uncleanness of Secretions. - These include (1) a running issue from a man (Leviticus 15:2-15); (2) involuntary emission of seed (Leviticus 15:16, Leviticus 15:17), and the emission of seed in sexual intercourse (Leviticus 15:18); (3) the monthly period of a woman (Leviticus 15:19-24); (4) a diseased issue of blood from a woman (Leviticus 15:25-30). They consist, therefore, of two diseased and two natural secretions from the organs of generation.