Leviticus 15:16

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 F3 "----& noctem flumine purgas." Pers. Satyr. 2. :

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 F4 Chaeremon. apud Porphyr. de Abstinentia, l. 4. c. 7. so the Jewish priests did when the like happened to them asleep in the temple F5 Misn. Tamid. c. 1. sect. 1. ; see Deuteronomy 23:10 .