According to search-discovered classical Islamic scholarship, the concept of Ajr (Recompense) is a foundational tenet of divine justice and mercy in the Quran. Linguistically rooted in the idea of wages or compensation, Al-Tabari clarifies that in the Quranic context, it signifies Allah's guaranteed reward for faith and righteous deeds. Ibn Kathir's analysis across numerous verses, such as 11:115 ('And be patient, for indeed, Allah does not allow to be lost the reward of the doers of good'), emphasizes this as a divine, unbreakable promise. The synthesis of the 30 key verses on this topic reveals that Ajr is multifaceted, encompassing both worldly honor, as given to Prophet Yusuf (12:56), and the ultimate, eternal bliss of Paradise (78:32-36). Al-Qurtubi's commentaries highlight that this recompense is not merely transactional but is an expression of divine grace, often multiplied and bestowed generously, especially upon the 'Muhsinin' (doers of good). This comprehensive framework establishes Ajr not as a mere payment, but as the manifestation of Allah's covenant to justly and abundantly reward every good act.