One possible place to start exploring this question is with the Jewish Bible, which includes several references to Satan but does not provide a clear or consistent explanation of his nature or origins. Some scholars point to passages such as Isaiah 14:12-15 and Ezekiel 28:12-19, which describe the fall of the king of Babylon and the prince of Tyre respectively, as possible sources for the idea of a fallen angel. These passages use metaphorical language to describe the pride and downfall of powerful leaders, but some Jewish commentators have interpreted them as referring to a celestial rebellion led by an angelic being.

Another potential source of information on the Jewish concept of Satan is rabbinic literature, including the Talmud and Midrash. These texts contain a wealth of stories and teachings about Satan, some of which portray him as a tempter or accuser rather than a rebel. Some rabbinic sources also suggest that Satan is a distinct entity from the fallen angels, although there is no consensus on this point.

In Judaism, the concept of Satan is complex and multifaceted, and there is no one definitive answer to the question of whether Satan is a fallen angel. However, some Jewish texts and traditions do portray Satan as an angel who rebelled against God and was cast out of heaven.