Speak unto the children of Israel,.... From whence we learn, says the above mentioned writer, that these uncleannesses were only usual among the children of Israel, not among the Gentiles; that is, the laws respecting them were only binding on the one, and not on the other :and say unto them, when any man; in the Hebrew text it is, "a man, a man", which the Targum of Jonathan paraphrases, a young man, and an old man:hath a running issue out of his flesh; what physicians call a "gonorrhoea", and we, as in the margin of our Bibles, "the running of the reins":[because of] his issue, he [is] unclean; in a ceremonial sense, though it arises from a natural cause; but if not from any criminal one, from a debauch, but from a strain, or some such like thing, the man was not defiled, otherwise he was; the Targum of Jonathan is,"if he sees it three times he is unclean;''so the Misnah .
So Maimon. & Bartenora in Misn. Edaiot, c. 5. sect. 1. Zabim, c. 1. sect. 1. Maimon.