Charles Ellicott Commentary Leviticus 15:16

"And if any man`s seed of copulation go out from him, then he shall bathe all his flesh in water, and be unclean until the even." — Leviticus 15:16 (ASV)

And if any man’s seed. —The second case, discussed in this and the following verses, is that of an involuntary emission, as in Deuteronomy 23:10. The man who sustained it had simply to immerse his whole body in water the following morning, and remain unclean till sundown. Similar rites were performed by the ancients under the same circumstances. Thus the Egyptian priests when they were defiled by a dream purified themselves by bathing their bodies; and, according to the directions of the Quran, any faithful Muslim who meets with such an accident must not perform his prayers till he has gone through the prescribed ablution. (Quran, 4:4 6.)