This is a transcript and translation of the Maariv service for Shabbat evening in the Old Persian rite, as recorded in MS Adler 23 ENA (https://hebrewbooks.org/20923) in the JTS Library. The Old Persian rite shows some fascinating unique linguistic features. The first thing that immediately strikes one is its tendency towards poetic extensions and doublings, even in texts (such as the Avot blessing) where most other rites are almost completely uniform. It also shows some nonstandard vocalizations that appear to be influenced by the Babylonian system of vocalization. In modern Persian communities the standard rite is a variation of the Sephardic rite used throught the Mizraḥi world, but this older rite with its unique facets deserves to be preserved as well. This is part 1 of a planned series of transcripts and translations from MS Adler 23 ENA. . . .