The manuscripts of the Iranian Pahlavi Yasna contain two consecutive colophons, the second of which relates the story of how their common ancestor manuscript, which combines the Avestan text of the Yasna with its Pahlavi version, was created. It is argued that Rōstahm Dād-Ohrmazd produced the first Pahlavi Yasna manuscript by taking the Avestan text from one manuscript and the Pahlavi text of a manuscript by Farrbay Srōšayār. Furthermore, it is argued that Rōstahm Dād-Ohrmazd wrote this manuscript both for himself and for Mahayār Farroxzād, who was from the province of Bīšāpuhr. The manuscript of Rōstahm Dād-Ohrmazd was then copied by Māhwindād Narmāhān, who composed the second colophon. This article also discusses the first colophon as it appears in the Iranian Pahlavi Yasna manuscript T54, which differs from other manuscripts of this group as it includes a passage written by a scribe called Kāyūs. It is argued that T54 was produced by Kāyūs, who added this passage to its first colophon. Furthermore, variant readings of these two colophons in two manuscripts of the Iranian Pahlavi Yasna, which also include Kāyūs's passage, are discussed. Unlike T54, Kāyūs's passage forms a separate colophon in these two manuscripts. It is suggested the two colophons are corrected according to the mindset of their respective scribes.