Why There Is No Single Book of Sharia: Understanding Islam's Diverse Legal Tradition

There is a question that rarely receives sufficient attention in political discussions about Islam: if Sharia is a system of law, where is its authoritative rulebook?

Governments invoke it. Religious scholars interpret it. Political movements promise to implement it. In some countries, it forms the foundation of legislation, while in others it governs particular areas of personal and family life. Yet there is no single comprehensive volume that functions as a universally accepted legal code for all Muslims.

The absence is not simply a matter of religious history or an incomplete publishing tradition. It reflects something fundamental about how Islamic law developed.

Sharia is rooted in divine revelation, but much of the detailed legal system associated with it emerged through centuries of human interpretation. Scholars disagreed over the meaning of religious texts, developed different methodologies for deriving legal rulings and established schools of jurisprudence that continue to influence Muslim societies.

This distinction is central to understanding the subject.

In Shari'ah Law: An Introduction, published by Oneworld Publications in 2008, Mohammad Hashim Kamali examines precisely this intellectual and legal tradition. Rather than treating Islamic law as a fixed collection of religious commands, he explores its sources, objectives, characteristic features, competing schools and capacity for adaptation.

The book provides an important explanation of why Sharia cannot be reduced to one book, one interpretation or one universally accepted legal system.

The Quran is the foundation, but it is not a comprehensive legal code

The first place to look when asking where Islamic law comes from is the Quran.

For Muslims, the Quran is the central religious scripture and the primary source of divine guidance. It contains moral principles, religious obligations, rules concerning family relationships, inheritance, commercial conduct and other matters relevant to social life.

But it is not structured like a modern national legal code.

A contemporary legal code typically organises legislation into specific categories, establishes definitions, sets out procedures and identifies the consequences of violating particular provisions. The Quran does not attempt to provide an exhaustive legislative framework covering every possible circumstance in human society.

Instead, its legal content exists alongside extensive spiritual, moral, theological and ethical guidance.

This means that determining how particular principles apply to specific circumstances requires interpretation.

The Sunnah, consisting of the teachings, actions and reported practices of the Prophet Muhammad, provides another foundational source. Through hadith literature, scholars examine the Prophet's words and conduct to understand how Quranic principles were demonstrated and applied.

Together, the Quran and Sunnah provide the primary revealed foundations of Islamic law.

However, they do not eliminate the need for legal reasoning.

Questions arise about the authenticity and interpretation of particular reports, the relationship between different texts, the application of general principles to specific situations and how religious guidance should address circumstances that were not explicitly discussed in the foundational sources.

This is where Islamic jurisprudence becomes essential.

Sharia and fiqh: The distinction that explains everything

One of Kamali's most important contributions is his examination of the relationship between Sharia and fiqh.

The two terms are frequently used interchangeably in everyday discussions, but they are not identical.

Sharia refers to the divinely grounded path or framework of guidance in Islam. Fiqh, on the other hand, refers to the human understanding of Islamic legal principles and their application.

The distinction has significant consequences.

If Sharia is understood as divine guidance, its ultimate authority belongs to God within Islamic theology. But fiqh represents the efforts of human scholars to understand that guidance.

Human beings can disagree. They can reach different conclusions, reconsider earlier judgments and interpret the same religious source through different methodologies.

Consequently, a particular legal ruling issued by a scholar is not automatically identical to divine revelation.

This distinction helps explain why Muslim scholars have historically disagreed on questions of law without necessarily rejecting the religious foundations they share.

It also challenges the assumption that every law implemented in the name of Sharia represents an uncontested divine command.

A government may describe its legislation as Islamic, but the legal interpretation underlying that legislation remains a human exercise.

That is one reason why different Muslim-majority countries can claim to apply Sharia while maintaining substantially different legal systems.

Why Islamic law developed different schools

The absence of one comprehensive legal rulebook becomes even clearer when examining the development of Islamic jurisprudence.

Over centuries, Muslim scholars developed different approaches to interpreting the Quran and Sunnah and deriving legal rulings.

These approaches eventually produced established schools of Islamic law, known as madhahib.

Among Sunni Muslims, four schools became particularly influential.

The Hanafi school, associated with Abu Hanifa, developed a significant tradition of legal reasoning and became influential across parts of the Ottoman Empire, South Asia and Central Asia.

The Maliki school, associated with Malik ibn Anas, placed particular importance on the established practices of the early Muslim community in Medina. It became influential across North and West Africa.

The Shafi'i school, associated with Muhammad ibn Idris al-Shafi'i, made an important contribution to the systematic development of Islamic legal methodology. Its influence spread through parts of East Africa, Southeast Asia and elsewhere.

The Hanbali school, associated with Ahmad ibn Hanbal, became particularly influential in parts of the Arabian Peninsula.

Shia Islam developed its own legal traditions, including the Ja'fari school, which has a major role in Twelver Shia jurisprudence.

These schools share foundational religious sources, but they differ in their approaches to legal interpretation and the weight they assign to different forms of evidence and reasoning.

Their existence is not evidence that Islamic law has no foundations. Rather, it demonstrates that those foundations have been approached through different intellectual traditions.

Kamali dedicates an entire chapter to the leading schools of law, examining their development and place within the wider Islamic legal tradition.

The significance is straightforward: Sharia is not a single legal interpretation that has remained unchanged across every Muslim society. Its detailed jurisprudence developed through multiple scholarly traditions.

Disagreement is part of the legal tradition

Perhaps the most revealing chapter of Kamali's book concerns ikhtilaf, the concept of juristic disagreement, and pluralism within Sharia.

In many modern political debates, disagreement over religious law is presented as a problem that must be eliminated. Political movements often claim that their interpretation represents the authentic or complete implementation of Islamic principles.

But disagreement has a long history within Islamic jurisprudence.

Scholars differed over how to interpret religious texts, evaluate hadith, understand the implications of particular Quranic passages and apply legal principles to new circumstances.

These differences did not necessarily mean that one side rejected Islam or that the other lacked religious legitimacy.

Instead, they reflected different methods of reasoning.

Consider a legal question for which the Quran and authenticated Sunnah provide no explicit, universally agreed detailed ruling. Scholars may examine broader principles, historical precedents, established practices and other forms of legal reasoning to reach a conclusion.

Different methodologies can produce different answers.

The result is a legal tradition in which disagreement has been an enduring feature of scholarship.

This is particularly important because it challenges the modern assumption that a country can simply declare one interpretation of Sharia and thereby settle every religious and legal question for its population.

The question of whose interpretation should prevail remains both a theological and political issue.

The role of ijtihad: Why Islamic law can change

If Islamic law developed through centuries of interpretation, can it respond to circumstances that did not exist when its foundational texts emerged?

Kamali addresses this through the concept of ijtihad, the exercise of independent legal reasoning by qualified scholars.

Ijtihad allows jurists to examine religious sources and apply established principles to questions that require new legal judgments.

It is particularly important when societies encounter developments that earlier generations could not have anticipated.

Consider modern banking, digital financial transactions, organ transplantation, genetic technologies and environmental regulation.

These issues raise questions that cannot always be answered by identifying a direct instruction in an ancient religious text.

Islamic scholars therefore examine the relevant sources, legal principles and objectives of Sharia to determine how particular developments should be understood.

The process does not mean that scholars can disregard foundational religious sources or simply declare whatever they consider desirable to be Islamic law.

Ijtihad is a disciplined exercise governed by established principles of jurisprudence.

Nevertheless, it demonstrates that Islamic legal reasoning is not necessarily limited to reproducing the conclusions of earlier generations.

Kamali also examines fatwa, a juristic opinion issued in response to a question concerning Islamic law.

A fatwa is not automatically equivalent to legislation or a binding judicial decision. Its authority depends on the circumstances, the institution issuing it and the legal framework in which it operates.

This distinction is important in an era when religious rulings circulate internationally through television, social media and online platforms.

Two scholars can issue different fatwas on the same subject without either ruling automatically becoming the universally binding position of Islam.

What is Sharia actually trying to achieve?

Another important dimension of Kamali's work is the concept of maqasid al-Sharia, commonly translated as the objectives or higher purposes of Islamic law.

This approach moves the discussion beyond individual rules and examines the broader purposes that Islamic jurisprudence is intended to serve.

Classical Islamic scholarship identified several fundamental interests associated with these objectives, commonly including the protection of religion, life, intellect, family or lineage, and property.

Later scholars expanded and developed the discussion, examining additional concerns such as justice, human dignity, social welfare and public interest.

The significance of maqasid is that Islamic legal reasoning is not concerned exclusively with identifying what is permitted and prohibited.

It also considers the purposes behind legal principles and the welfare they are intended to promote.

This becomes particularly important when scholars confront new circumstances for which established legal texts do not provide an explicit answer.

For example, a contemporary financial transaction may involve technologies and contractual arrangements that did not exist in earlier centuries. Jurists can examine the transaction through established legal principles concerning fairness, ownership, risk, exploitation and the protection of property.

The same approach can be applied to questions involving public health, environmental protection and emerging technologies.

Maqasid therefore provides another explanation for why Sharia cannot be adequately represented by one static collection of rules.

Its interpretation involves both foundational texts and continuing discussions about the purposes those texts are intended to serve.

When religious interpretation becomes state law

The question becomes more complicated when Sharia moves from religious scholarship into government institutions.

Historically, Islamic jurisprudence developed through a relationship between religious scholars, judges, rulers and local communities.

The modern nation-state operates differently.

It generally seeks to establish a centralised legal system, define the authority of courts and legislatures, and enforce a relatively uniform body of law across a particular territory.

When governments claim to implement Sharia, they must therefore confront a question that Islamic jurisprudence itself does not automatically resolve: which interpretation should become the law of the state?

A government may adopt the jurisprudence of a particular school, combine different legal opinions or establish legislation based on its own interpretation of Islamic principles.

It may also incorporate selected elements of Islamic jurisprudence into an otherwise modern legal system.

The outcomes vary significantly.

Saudi Arabia, Iran, Pakistan and Indonesia, for example, have different constitutional arrangements, legal institutions and relationships between Islamic jurisprudence and state legislation.

It would therefore be inaccurate to describe all four as operating under one identical Sharia legal system.

This diversity also explains why political disagreements about Sharia are often disagreements about state power.

Who determines the official interpretation? Can citizens challenge religiously justified legislation in court? What authority should religious scholars possess? How should constitutional rights interact with religious legal principles?

These are questions about political legitimacy and institutional authority as much as they are about religion.

Kamali devotes considerable attention to these issues, including the relationship between Sharia, democracy, fundamental rights, the principle of legality and Sharia-oriented government policy.

The result is a discussion that reaches beyond religious doctrine into the foundations of modern political order.

The problem with treating Sharia as a single, finished legal code

The political language surrounding Sharia often assumes that there is a complete legal system waiting to be implemented.

But this assumption overlooks the historical development of Islamic jurisprudence.

There is no single universally accepted volume that resolves every legal question for every Muslim. There are foundational religious texts, extensive bodies of hadith, centuries of scholarly interpretation, competing legal methodologies and different institutional traditions.

Even the question of how to interpret a particular source can become the subject of disagreement.

This does not mean that Sharia is without structure or that every interpretation is equally authoritative. Islamic jurisprudence has developed sophisticated rules governing legal reasoning, the assessment of evidence and the qualifications of scholars.

But it does mean that the relationship between revelation and human interpretation cannot be ignored.

A government that claims to implement Sharia is necessarily making decisions about which scholarly interpretations to adopt, which institutions to empower and which legal principles to enforce.

Those decisions have political consequences.

The distinction between divine authority and human interpretation therefore becomes particularly important when religious principles are transformed into enforceable state legislation.

Is Kamali's book the answer?

Shari'ah Law: An Introduction is valuable precisely because it does not approach Islamic law as a simple list of prohibitions and punishments.

Across its chapters, Kamali examines the nature and sources of Sharia, the leading schools of jurisprudence, juristic disagreement, the objectives of Islamic law, independent reasoning and the relationship between religious principles and modern government.

Its greatest contribution is the broader picture it provides.

Readers encounter a legal tradition that developed through centuries of scholarship and debate, rather than a single system that can be understood by examining a handful of controversial laws.

The book is also particularly useful because it addresses subjects that are frequently missing from popular discussions, including legal pluralism, the principle of legality, democracy, fundamental rights and the possibility of adaptation and reform.

There are limitations.

Published in 2008, it cannot account for every subsequent political development in Muslim-majority countries. Nor is it a detailed comparative study of every contemporary national legal system.

It is an introduction to the intellectual foundations of Islamic law, not a complete account of every modern controversy involving Sharia.

Nevertheless, for readers seeking to understand why Islamic law has multiple interpretations and how those interpretations developed, it offers a substantial starting point.

The bigger question: Who has the authority to define Sharia?

The absence of one universally accepted book of Sharia is not simply a question about where Muslims should look for legal guidance.

It reveals a deeper tension between religious authority, scholarly interpretation and political power.

The Quran and Sunnah provide the foundational sources of Islamic law. But the detailed jurisprudence that developed around those sources emerged through human reasoning, disagreement and the evolution of different scholarly traditions.

That history produced a diverse legal tradition rather than one universally codified system.

The consequences remain visible today.

When political leaders promise to implement Sharia, they are not merely promising to enforce an uncontested collection of rules. They must decide which interpretation to adopt, whose religious authority to recognise and how those principles should interact with the institutions of a modern state.

Kamali's book helps readers understand why those decisions are neither simple nor purely theological.

Perhaps the most important lesson is that understanding Sharia requires more than asking what Islamic law says. It requires asking who interprets it, how those interpretations acquire authority and why different Muslim societies arrive at different legal conclusions.

There may be no single book of Sharia, but there is a long and sophisticated intellectual history behind the many books, schools and institutions through which Muslims have sought to understand it.