Verse Ex08-14b discussing the attempt of the Egyptian sorcerors to imitate Moses states And the Egyptian witches did so with their secret arts to bring forth gnats, but they could not; and there were gnats upon man, and upon beast. Rashi clarifies. I have added additional material to Rashi based on unpublished essays I have written about the Biblical witchcraft probhibitions. Witches were people who induced hallucinations in people. The hallucinations might consist of the people flying or of having huge possessions. The people did not fly in the real world nor did they have huge possessions in the real world. Rather, they hallucinated them. Thus although the witchcraft did not affect the real world it was real, in fact it was a real hallucination. Witches accomplished this through a combination of drugs, hallucinogens and physiological behaviors that induced heightened states of awareness and stress, the stress being conducive to the formation of hallucinations. The word for psychic forces that induce hallucinations is shad the same Hebrew word as breast, since female breast exposure is one technique of stress induction which say in a dim lit room can facilitate hallucination formation. (It is well known (e.g. Rashi Ex22-17) that witches were typically female, undoubtedly because they could skillfully use their bodies to induce hallucinatory experiences.) Witchcraft (as just described) is a formal act of treason against God punishable by a level one death penalty. However there are rules governing these types of hallucinations: They are typically hallucinations of large objects, not of microscopic or small objects. Consequently the Egyptian Witches when they tried to induce hallucinations of gnats failed because the gnats were extremely small creatues. Since Rashi uses real-world information, the nature of witchcraft, to clarify the meaning of this verse we classify this Rashi as a Non Verse method.