The "Mithras Liturgy" is a magical text from the Great Magical Papyrus of Paris, part of the Greek Magical Papyri, numbered PGM IV.475-834. The modern name by which the text is known originated in 1903 with Albrecht Dieterich, its first translator, based on the invocation of Helios Mithras (Ἥλιοϲ Μίθραϲ) as the god who will provide the initiate with a revelation of immortality. The text is generally considered a product of the religious syncretism characteristic of the Hellenistic and Roman Imperial era, as were the Mithraic mysteries themselves. Some scholars have argued that it has no direct connection to particular Mithraic ritual. Others consider it an authentic reflection of Mithraic liturgy, or view it as Mithraic material reworked for the syncretic tradition of magic and esotericism.
The codex containing the text was acquired by the Bibliothèque Nationale in 1857. It is thought to date to the early 4th century AD, though Dieterich proposed a date of composition as early as 100–150 AD. Its likely provenance in Egypt, where evidence of Mithraic cult is rare, presents a major obstacle to regarding it an authentic liturgy.
Marvin Meyer divides the Mithras Liturgy into two sections: Lines 475–750 are a liturgy for the mystic ascent of the soul through seven stages, and 751–834 provide instructions on how to enact the liturgy.
The text begins by invoking Providence (Pronoia) and Psyche ("Soul") or in other readings Tyche. The speaker of the invocation announces that he is writing down the mysteries to offer instruction and not for gain, and that he seeks a revelation of the universe and immortality guided by an archangelos (ἀρχάγγελος, "high messenger") of Helios Mithras (lines 475–485).