3. Mose 15:16

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.

In this chapter we have laws concerning other ceremonial uncleannesses contracted either by bodily disease like that of the leper, or some natural incidents, and this either, I. In men (v. 1-18). Or, II. In women (Lev 15:19-33). We need not be at all curious in explaining these antiquated laws, it is enough if we observe the general intention; but we have need to be very cautious lest sin take occasion by the commandment to become more exceedingly sinful; and exceedingly sinful it is when lust is kindled by sparks of fire from God's altar. The case is bad with the soul when it is putrefied by that which should purify it.

15:16-17 In the case of an emission of semen, the discharge was not a sign of illness (see study note on 15:1-33). Still, the same rule applied; the man must wash and be considered unclean until the next evening.