The Nakatomi Purification Prayer is not a single, frozen formula, but a living liturgical current that has flowed through different ages and regions while retaining a recognizable core. The version preserved in the Engishiki, compiled in the early Heian period, serves as a kind of classical axis: it records the form used for the great courtly rites of purification and has long been treated as a standard point of reference. Yet even around this axis, medieval manuscripts and later compilations show small but meaningful differences in wording, phrasing, and length, including expanded or abbreviated passages. These variations suggest that the prayer was transmitted not only as a text but as a ritual practice, open to subtle adjustment in response to context and lineage.

Over time, distinct historical layers of the prayer can be discerned. Heian sources already attest to slightly different wording in certain passages, indicating that variation began early in the prayer’s recorded life. Medieval manuscripts continue this pattern, preserving alternative readings and ritual nuances, while Edo-period anthologies sometimes present longer or shorter forms suited to particular ceremonial settings. Across these strata, the core mythic and purificatory intent remains stable, even as the surface of the language shifts and is refined.

Regional and lineage-based traditions add another dimension to this diversity. Shrines associated with particular priestly houses, especially those tracing their heritage to the Nakatomi, have maintained versions with minor textual distinctions that express their own ritual self-understanding. Local shrines may incorporate references to nearby places or kami, or adjust the style of expression to harmonize with regional speech and sensibility. In some mountain and island communities, the prayer appears in forms that emphasize additional purificatory elements or adapt the rite to specific environments such as pilgrimage routes or maritime life.

Temple-shrine complexes before the formal separation of Buddhist and Shinto institutions also contributed to the spectrum of practice. In such settings, the structure of the Nakatomi Purification Prayer could be framed by extended opening or closing formulas, and at times interwoven with elements resonant with Buddhist ritual language. Even where the textual differences are slight, they reveal a pattern: the prayer has served as a shared spiritual backbone for purification, while allowing each community, lineage, and era to inscribe its own inflection upon the enduring narrative of cleansing and renewal.