The aim of the present paper is to illustrate as a case study, the linguistic and stylistic peculiarities characterizing the third book of the Dēnkard, one of the most authoritative texts in Zoroastrian Pahlavi literature (9th-10th CE). The analysis will consider these features as part of a coherent system, styled to serve the dialectic strategies pursued by the Zoroastrian high priests in response to the pressures their own community was facing in the early Islamic period. In order to provide a more comprehensive overview on DkIII language distinctiveness, the research will underline the outward/inward dynamics, addressing both the relation of this theological dialectic with the surrounding socio-cultural environment and the leadingrole claims of a group within a politically subordinated community.