[2][3][4] Avestan ahura "lord" derives from Proto-Indo-Iranian language *Hásuras, also attested in an Indian context as Rigvedic asura.
As suggested by the similarity to the Old Norse æsir, Indo-Iranian *Hásuras may have an even earlier Proto-Indo-European language root.
In the Gathas, the oldest hymns of Zoroastrianism and thought to have been composed by Zoroaster, followers are exhorted to pay reverence to only the ahuras and to rebuff the daevas and others who act "at Lie's command".
[9] In the Fravaraneh, the traditional name for the Zoroastrian credo summarized in Yasna 12.1, the adherent declares: "I profess myself a Mazda worshiper, a follower of the teachings of Zoroaster, rejecting the daevas ... " This effectively defines ahura by defining what ahura is not.
Other divinities with whom the term "Ahuric" is associated include the six Amesha Spentas, and (notable among the yazatas) Anahita of the Waters and Ashi of Reward and Recompense.