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Isaiah or Yeshayahu ben Avraham Ha-Levi Horowitz (Hebrew: ישעיה בן אברהם הלוי הורוויץ), (c. 1555[1][2] – March 24, 1630), also known as the Shelah HaKaddosh (השל"ה הקדוש "the holy Shelah") after the title of his best-known work, was a prominent rabbi and mystic.