Most of the ancient religions made a similar recognition of impurity and of the need of purfication.

And if any man's seed of copulation go out from him,.... Not in lawful cohabitation, nor voluntarily, but involuntarily, as Aben Ezra observes; not through any disorder, which came by an accident, or in any criminal way, but through a dream, or any lustful imagination; what is commonly called nocturnal pollution (c):

then he shall wash all his flesh in water, and be unclean until the even; and so the Egyptian priests, when it happened that they were defiled by a dream, they immediately purified themselves in a laver (d) so the Jewish priests did when the like happened to them asleep in the temple (e); see Deuteronomy 23:10.

(c) "----& noctem flumine purgas." Pers. Satyr. 2.((d) Chaeremon. apud Porphyr. de Abstinentia, l. 4. c. 7. (e) Misn. Tamid. c. 1. sect. 1.

Involuntary emission of seed. - This defiled for the whole of the day, not only the man himself, but any garment or skin upon which any of it had come, and required for purification that the whole body should be bathed, and the polluted things washed.

And if any man's seed of copulation go out from him, then he shall wash all his {f} flesh in water, and be unclean until the even.

(f) Meaning, all his body.

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.