Mihr Yasht

The Mihr Yasht is a long hymn of the Avesta dedicated to Mithra (Avestan Mithra, Middle Persian Mihr), the god of the covenant and of the light that precedes the sunrise, who watches over oaths and agreements and whose thousand ears and ten thousand eyes see whether they are kept. One of the longest and most important of the Yashts, the hymns to individual divine beings, it portrays Mithra as a mighty upholder of truth and punisher of the covenant-breaker, driving across the sky in his chariot, protecting the lands whose people are faithful and bringing ruin on those who lie. The hymn is a principal source for the character of this widely revered deity, whose worship extended far beyond Iran and who lies in the distant background of the Roman cult of Mithras. Preserved and recited within the Zoroastrian liturgy, the Mihr Yasht expresses the tradition's central concern with truth and the keeping of one's word, personified in a god who sees all and rewards fidelity and betrayal alike.

Mithra's Avestan portrait as the all-seeing guardian of covenants, positioned between the earthly and heavenly realms and never sleeping in his vigilance, has drawn extensive comparison from scholars of religion to the later Roman mystery cult of Mithras, though the exact relationship between the Iranian yazata and the Roman god remains a genuinely disputed question, since the Roman cult's iconography and initiatory structure have no clear precedent in the surviving Avestan material. Within Zoroastrianism itself the Mihr Yasht remains part of the liturgy recited on the days and in the month dedicated to Mithra in the Zoroastrian calendar.

Mithra as described in this Yasht, guardian of contracts and covenants who cannot be deceived and who observes from the light before sunrise whether agreements between people are honored, is the Zoroastrian development of a figure attested even earlier in the wider Indo Iranian religious world, related to the Vedic Mitra recorded independently in the Rig Veda, evidence the god predates Zoroastrianism itself and was absorbed into the developing Zoroastrian system rather than originating within it. Centuries later and in an entirely different empire, a god called Mithras became the object of a popular mystery cult across the Roman world, especially within the Roman army, from roughly the first to the fourth centuries CE, complete with its own initiatory grades, underground temples called mithraea, and iconography, most famously depicting Mithras slaying a bull, that has no clear counterpart in the Zoroastrian material at all.

How much genuine continuity connects the Avestan Mithra of this Yasht to the Roman Mithras of the mystery cult is a long running and unresolved scholarly debate. The early twentieth century historian Franz Cumont argued for substantial continuity, treating Roman Mithraism as a transplanted and adapted Persian religion. Later scholars, including Roger Beck among others, have argued the Roman cult was largely a new Roman creation that borrowed the name and some Persian trappings for exotic prestige while inventing much of its actual theology and central bull slaying iconography independently, with little direct doctrinal continuity from the Avestan material. The debate remains open, and this Yasht is frequently cited by both sides despite supporting neither conclusively on its own.