Rabbi Abraham Ibn-Daud – Sefer Hakabbalah. Sefer ha-Qabbalah. ספר הקבלה לרב אברהם בן דוד (ראב”ד) Rabbi Abraham Ibn-Daud (ben David) Halevi, known as Rabad (born circa 1110; died 1180). A prominent scholar and translator, arguably he “…introduced Arabic numerals...
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