The corpus known as the PGM (Papyri Graecae Magicae) gathers spells from the 2nd century BCE to the 5th century CE, preserved mainly in a cache of Theban handbooks, including the Great Magical Papyrus of Paris (PGM IV) and the London-Leiden papyrus. Karl Preisendanz published the critical edition (1928-31); Hans Dieter Betz's English translation (1986, 2nd ed. 1992) made the corpus accessible. The so-called Mithras Liturgy is embedded in PGM IV.
The papyri's signature is the long strings of untranslatable 'words of power', voces magicae, names like Abrasax and the seven Greek vowels arranged as sonic formulas. Scholars debate whether they are corrupted foreign names, intentional nonsense, or sound-technology; practitioners treat them as the point.
The PGM strips magic of metaphysics: what survives is transactional, invocations, ingredients, timing, threats, and coercions, including spells that compel gods by reciting their own secret names back at them. It is religion's plumbing, documented.
If a spell is a formula, is belief an ingredient or a byproduct?