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The New York Public Library, Dorot Jewish Division

  Sefer Beriah by Nathan the Prophet of Gaza (MS, Ottoman empire, c. 1700).

The Book of Creation, a system of messianic kabbalah, was the magnum opus of the chief theoretician and ever-loyal proponent of Shabbetai Tsevi. Written by Nathan after Shabbetai's ostensible defection to Islam, when most Jews no longer regarded him as the messiah but as a charlatan, the book circulated in manuscript only.