The Jameh Mosque of Qasbah Gonabad is a historical monument dating back to the Khwarazmian period, and, most notably, the Qajar period. Among its decorative features are the stucco ornaments of the northeastern entrance portal, as well as the three mihrabs located in the front iwan and the southeastern and northeastern prayer halls. This study aims to provide a mystical (Sufi) interpretation of the motifs and inscriptions incorporated into the Qajar-period stucco decorations of the mosque. Accordingly, it seeks to answer the following question: How can the Qajar stucco decorations of the northeastern entrance and the three mihrabs be interpreted from a mystical perspective, and what relationship might they have with the cultural and environmental context of that period?

The findings indicate that the Qajar inscriptions of the Jameh Mosque are expressed through the motifs of the Murgh-e Bismil (the sacrificial bird), the calligraphic form of the letter Lā (لا) at the northeastern entrance, and the Chalipā-ye ‘Alī (cross-shaped calligraphic composition of the name ‘Alī) in the principal mihrab. Collectively, these motifs present Imam ‘Alī as the manifestation of the cosmos, while the Murgh-e Bismil symbolizes the precedence of divine mercy over divine wrath. The numerical symbolism and recurring numbers embedded in the decorative program further underscore the centrality of wilāyah. The hoopoe depicted as guarding the cypress containing the calligraphic Lā may represent the Sufi-inclined people of Gonabad, as well as the dervishes, who sought divine blessing and lawful sustenance through spiritual striving and gratitude.