This paper delves into the profound contributions of ‘Abdur Raḥmān Nāṣir As-Si’dī in elucidating the concept of Al-Adillah within the realm of Islamic jurisprudence. By exploring As-Si’dī’s systematic approach to the evidentiary sources of Fiqh, the study underscores the centrality of the Qur’ān and the Sunnah, alongside the complementary roles of Ijmā’ (consensus) and Al-Qiyās Aṣ-Ṣaḥīḥ (sound analogy), as foundational pillars for deriving legal rulings. As-Si’dī’s work reaffirms the integration and coherence of these sources within the Islamic legal framework, countering claims that Fiqh is devoid of scriptural basis. This investigation highlights As-Si’dī’s insistence on the rootedness of Islamic Aḥkām in these evidences, whether through direct textual references, scholarly consensus, or rational deduction. The paper emphasizes that true jurisprudential understanding and application hinge on tracing legal reasoning back to these established sources, a principle deeply embedded in traditional Islamic scholarship. Through As-Si’dī’s lens, the paper reveals the depth of Islamic legal theory’s fidelity to its foundational texts, offering insights into the enduring relevance and unity of Islamic jurisprudence
