Sa'id Nursi is renowned globally for his contributions to the Muslim community, particularly in Turkiye, where he is esteemed by many. This qualitative study seeks to examine Sa'id Nursi's role in disseminating the message of da’wah and fostering Islamic awareness among the inmates at Denizli Prison, Turkiye. This holds significance as addressing criminal behavior and preventing recidivism should encompass more than punitive measures alone. The focus should also extend to rehabilitation, especially within an Islamic context, as an effective rehabilitation program can deter individuals from relapsing into criminal activities. Employing an inductive approach, this article delves into Sa'id Nursi's biography and his contributions, using a descriptive method to analyse and elaborate on the prominent aspects of his approach. Primary sources, notably Rasa'il al-Nur (Epistles of Light) penned during his incarceration, including the Fruits Epistle and the Rasa'il al-Nur website, along with secondary sources such as journals from library archives, form the basis of this study. It is instrumental in spotlighting his post-incarceration contributions through an Islamic lens within the prison context. Research affirms Nursi's commitment to imparting an Islamic message that resonates within Muslim life at Denizli Prison, Turkiye. The findings underscore Nursi's contributions through an Islamic approach that emphasizes recognition of Allah SWT and the strengthening of faith in the hereafter. He achieves this by drawing on Quranic verses and Hadiths, employing the approach of bi-l-hikmah (wisdom), and engaging inmates' conscience through reflective practices such as tafakkur (contemplation). Nursi frequently utilizes majaz (metaphor) or dharb al-amthal (analogy) and al-muqaranah (comparison) to elucidate truths or facts in his teachings.