The concept of rizq (sustenance) is one of the fundamental themes in the Qur'an whose interpretation has evolved alongside the socio-historical and intellectual contexts of Qur'anic exegetes. Although numerous studies have examined the concept of sustenance from theological, thematic, and socio-economic perspectives, comparative research integrating classical and contemporary exegesis through Hans Robert Jauss's Reception Theory remains limited. This study aims to analyze the concept of rizq in the Qur'an through a comparative examination of Aṭ-Ṭabarī's Jāmi‘ al-Bayān and M. Quraish Shihab's Tafsir al-Miṣbāḥ, while exploring how the exegetes' horizons of expectation shape their interpretations. This research employs a qualitative library research method using descriptive-analytical and comparative approaches. Primary data were obtained from Jāmi‘ al-Bayān and Tafsir al-Miṣbāḥ, while secondary data were collected from relevant scholarly books and journal articles. The data were analyzed using Hans Robert Jauss's Reception Theory, particularly the concept of the horizon of expectations, to explain the dynamics of interpretation in both exegetical works. The findings reveal that Aṭ-Ṭabarī interprets sustenance within a normative-theological framework, emphasizing divine decree, adherence to Islamic law, and an eschatological orientation. In contrast, Quraish Shihab offers a more contextual interpretation by highlighting the relationship between divine providence, human endeavor, moral responsibility, and social ethics. These interpretive differences reflect the changing horizons of expectation shaped by the historical and intellectual contexts of each exegete. This study demonstrates that the Qur'anic concept of sustenance is dynamic and continuously reinterpreted while maintaining its essential theological foundation.