The phrase οἷς μετουσία θεοφιλοῦς ἑορτῆς presents a syntactic and semantic difficulty. The dative plural οἷς (relative pronoun) likely refers back to the chorus or the festive context, but its case relationship with μετουσία (a rare noun meaning 'sharing' or 'participation', often appearing in the phrase μετουσία τινός) is ambiguous. Some editors emend μετουσία to μετουσίᾳ (dative of means) or interpret it as a genitive dependent on a understood noun, suggesting a construction where the chorus 'plays with the participation in the god-loving festival.' The term μετουσία itself is exceptionally rare in Attic comedy outside this passage, appearing mostly in later philosophical or Christian texts, raising questions about whether Aristophanes is using a technical term or a nonce formation to evoke a sense of communal ritual.