Demon
Talmudic tradition and Midrashim

In the Jerusalem Talmud, notions of shedim ("demons" or "spirits") are almost unknown or occur only very rarely, whereas in the Babylonian Talmud there are many references to shedim and magical incantations. The existence of shedim in general was not questioned by most of the Babylonian Talmudists. As a consequence of the rise of influence of the Babylonian Talmud over that of the Jerusalem Talmud, late rabbis, in general, took as fact the existence of shedim, nor did most of the medieval thinkers question their reality. However, rationalists like Maimonides and Saadia Gaon and others explicitly denied their existence, and completely rejected concepts of demons, evil spirits, negative spiritual influences, attaching and possessing spirits. They thought the essential teaching about shedim and similar spirits is, that they should not be an object of worship, not a reality to be acknowledged or feared. Their point of view eventually became mainstream Jewish understanding.

The opinion of some authors is not clear. Abraham ibn Ezra states that insane people can see the image of se'irim, when they go astray and ascribe to them powers independent from God. It is not clear from his work, if he considered these images of se'irim as manifestations of actual spirits or merely delusions. Despite academic consensus, Rabbis disputed that Maimonides denied the existence of demons entirely. He would only dispute the existence of demons in his own life time, but not that demons had existed once.

Occasionally an angel is called satan in the Babylon Talmud. But satans do not refer to demons as they remain at the service of God: "Stand not in the way of an ox when coming from the pasture, for Satan dances between his horns".

Aggadic tales from the Persian tradition describe the shedim, the mazziḳim ("harmers"), and the ruḥin ("spirits"). There were also lilin ("night spirits"), ṭelane ("shade", or "evening spirits"), ṭiharire ("midday spirits"), and ẓafrire ("morning spirits"), as well as the "demons that bring famine" and "such as cause storm and earthquake". According to some aggadic stories, demons were under the dominion of a king or chief, usually Asmodai.
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