‌Context & Objective: Following the movement of constitutional codification, legal systems frequently utilize diverse sources to design their constitutions, prominently drawing upon the constitutional experiences of other nations. The transfer of legal ideas from a foreign jurisdiction requires a definitive framework to ensure accurate execution, a phenomenon identified conceptually as constitutional borrowing. Proper execution of constitutional borrowing necessitates strict adherence to foundational prerequisites. While certain general principles govern this practice universally across all legal frameworks, jurisdictions sharing a unified structural basis—specifically a foundation rooted in religion—require specialized principles. Islamic countries represent a prominent example of systems sharing this religious foundation. Given the globalization of the Islamic religion as a civilizational competitor and the contemporary efforts of various nations to Islamize their legal systems, establishing these specialized rules is critical. Historically, one of the vulnerabilities of modern Islamic revolutions has been the uncritical adoption of non-Islamic models without rigorous evaluation. Consequently, Islamic nations must observe specific mandates when borrowing from either Islamic or non-Islamic foreign constitutions. The primary objective is to conceptualize this phenomenon accurately and address the core question: What are the imperatives of constitutional borrowing in Islamic countries?
 ‌Method & Approach: A descriptive-analytical approach combined with a doctrinal methodology is utilized to address the central question. Library-based studies serve as the primary mechanism to systematically examine the concepts of constitutional borrowing and the defining characteristics of Islamic states, thereby establishing the precise normative framework governing the adoption of foreign constitutional elements in these jurisdictions.
 ‌Findings: The realization of functional constitutional borrowing in Islamic countries is contingent upon the strict observance of 16 specific imperatives. A primary imperative is the preservation of the structural identity of the ummah (the unified global Muslim community), ensuring that borrowed elements do not undermine Islamic solidarity. Borrowing is exclusively permissible within the manṭaqat al-farāgh (the sphere of discretionary matters where Islamic jurisprudence permits human legislative choice), prohibiting the adoption of foreign rules where definitive Islamic mandates exist. The process requires a committee of religious experts and committed jurists operating under the supervision of Islamic scholars. Decision-makers must verify the authenticity of purportedly Islamic propositions to prevent the infiltration of alien ideologies. The framework expressly prohibits extreme imitation of secular models, mandating the pursuit of an independent socio-economic paradigm. Borrowing must not impede the globalization of Islam or facilitate foreign domination, aligning with the principle of nafī-e sabīl (the prohibition of non-Muslim authority over Muslims). Islamic states must avoid rigid adherence to existing colonial infrastructures. The centrality of Sharīʿat (Islamic law) must remain intact, and constitutional architects must reject the wholesale adoption of foreign structural totalities. Borrowed elements must be meticulously aligned with the muḥkamāt (the clear, foundational principles) of Islam. The foundational ideals of the political system must be generated internally, and drafters must actively engage in lexical innovation rather than relying on foreign terminology. Adopted elements must simultaneously secure both religious legitimacy and popular acceptability. Finally, mandatory indicators of an Islamic constitution—such as the recognition of Islam as the official religion, the requirement that the head of state be Muslim, and the designation of Islam as the supreme source of legislation—are fundamental identity markers entirely exempt from the borrowing mechanism.
 ‌Conclusion: The realization of the normative goals of any political system relies heavily on the precise formulation of constitutional rules. Constitutional borrowing is not a mechanical imitation; rather, it constitutes an intentional mechanism that demands the active contextualization of foreign ideas. For a state to be genuinely classified as Islamic, it must fully base its political structure and governance on Islamic teachings rather than relying merely on demographic majorities. The application of the identified imperatives ensures that Islamic countries can benefit from accumulated human experience without compromising their ideological integrity. By adhering to these guidelines, states can prevent structural deviations, maintain the centrality of Islamic law, and actively facilitate the broader strategic objective of establishing a modern Islamic civilization.