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In page Ahura Mazda:

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Some scholars (Kuiper. IIJ I, 1957; Zimmer. Münchner Studien 1984:187–215) believe that Ahura Mazda originates from *vouruna-miθra, or Vedic Varuna (and Mitra).[citation needed] According to William W. Malandra both Varuna (in Vedic period) and Ahura Mazda (in old Iranian religion) represented the same Indo-Iranian concept of a supreme "wise, all-knowing lord".[1]