The present study aims to analyze the theological functions of the expression Ṣalawāt al-Rasūl in the process of deed acceptance by examining Qur’an 9:99 through a theological-exegetical approach and qualitative content analysis. The central question of the research concerns the extent to which this expression—beyond its lexical meaning of “supplication”—plays a role within the theological structure of the acceptance of human actions. The findings indicate that Ṣalawāt al-Rasūl encompasses two fundamental dimensions: epistemologically, it serves as an external sign distinguishing the believer from the hypocrite, while internally it generates tranquility and certitude of heart, thereby reducing the anxiety stemming from uncertainty about the acceptance of one’s deeds. Soteriologically, its formative (takwīnī) function, as an effective “cause” and “means,” completes and elevates human action for the reception of divine mercy. The innovation of the study lies in proposing a theological model of “triadic interaction in deed acceptance,” which conceptualizes the acceptance of deeds as the product of interaction among the stations of servanthood, prophethood, and lordship, identifying Ṣalawāt al-Rasūl as the essential mediating link connecting human action to divine grace. This model also provides a framework for reinterpreting related concepts such as intercession (shafāʿa) and seeking prophetic mediation (tawassul) through a functional lens