Question Breakdown
This question consists of two main segments. The first requires a detailed exposition of the four foundational sources of Islamic law, namely the Quran, Sunnah, Ijma, and Qiyas. This includes discussing their definitions, jurisprudential weight, scope, and role in shaping Islamic legal rulings. The second part of the question demands a specific elaboration on Ijma and Ijtihad, which are essential tools for deriving rulings in cases where explicit texts are absent. Therefore, the answer must combine textual references with scholarly opinions and provide examples that highlight their practical application in classical and modern Islamic jurisprudence.
Outline
- Introduction
- The Importance of Sources in Islamic Legal Theory (Usul al-Fiqh)
- First Source: The Quran
- A. Nature and Characteristics
- B. Types of Legal Verses
- C. Authority in Shariah
- Second Source: The Sunnah (Hadith)
- A. Definition and Classification
- B. Sunnah as Explanation of the Quran
- C. Legal Weight of Mutawatir and Ahad Hadith
- Third Source: Ijma (Consensus)
- A. Definition and Types of Ijma
- B. Classical Scholars on Ijma
- C. Authority and Application of Ijma
- Fourth Source: Qiyas (Analogical Deduction)
- A. Definition and Preconditions
- B. Examples from Classical Jurisprudence
- C. Role in Expanding Islamic Law
- Detailed Explanation of Ijma
- A. Historical Development and Usage
- B. Binding Nature According to Scholars
- C. Examples: Caliphate and Tarawih Prayer
- Detailed Explanation of Ijtihad
- A. Definition and Preconditions of a Mujtahid
- B. Types of Ijtihad
- C. Contemporary Relevance of Ijtihad
- Critical Analysis
- Conclusion

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Answer to the Question
Introduction
The Shariah, or Islamic law, is not merely a set of legal codes; it is a divine guidance that governs all aspects of a Muslim's life, spiritual, moral, social, and political. To maintain its authenticity and relevance across generations, Islamic law is derived from four primary sources recognized by consensus among Sunni scholars: the Quran, Sunnah, Ijma, and Qiyas. While the Quran and Sunnah offer foundational texts, Ijma and Ijtihad ensure that the Shariah remains adaptable and applicable in every era.
The Importance of Sources in Islamic Legal Theory
Usul al-Fiqh, or the principles of Islamic jurisprudence, lay down the methodological framework through which Islamic rulings are derived. Without clearly defined sources, the law would be subject to arbitrary interpretation; hence, the emphasis is on legitimate textual and rational bases for deriving legal rulings.
First Source: The Quran
A. Nature and Characteristics
The Quran is the literal word of Allah revealed to the Prophet Muhammad (PBUH). It is the primary source of all Islamic injunctions and contains verses that lay down direct legal commandments.
B. Types of Legal Verses
Out of over 6,000 verses, approximately 500 are considered legal (Ayat al-Ahkam), covering matters like inheritance, marriage, criminal justice, and contracts.
C. Authority in Shariah
No source can override the Quran. It is the foundation upon which all other sources rest. Allah says, "We have sent down to you the Book as clarification for all things..." (Surah An-Nahl 16:89).
Second Source: The Sunnah (Hadith)
A. Definition and Classification
The Sunnah refers to the sayings, actions, and approvals of the Prophet Muhammad (PBUH). It is classified as Sunnah Qawliyyah (sayings), Fi'liyyah (actions), and Taqririyyah (approvals).
B. Sunnah as Explanation of the Quran
It complements and explains Quranic injunctions. For example, the Quran commands Salah, but the Sunnah details how to perform it.
C. Legal Weight
Mutawatir (mass-transmitted) Hadith carry absolute authority, while Ahad (solitary) Hadith are also accepted unless contradicted.

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Third Source: Ijma (Consensus)
A. Definition and Types
Ijma refers to the unanimous agreement of qualified Muslim jurists on a legal matter after the death of the Prophet. It is divided into:
- Explicit Ijma (Ijma Sarih)
- Silent Ijma (Ijma Sukuti)
B. Classical Scholars on Ijma
Imam al-Shafi'i and Imam Ahmad ibn Hanbal emphasized Ijma as a binding source. Imam Nawawi stated, Whoever denies Ijma has left Islam."
C. Authority and Application
Ijma is seen as preserving the integrity of the law. For example, the consensus on Abu Bakr's caliphate or compiling the Quran was accepted as binding by all.
Fourth Source: Qiyas (Analogical Deduction)
A. Definition and Preconditions
Qiyas involves applying a known ruling from the Quran or Sunnah to a new case due to shared 'illah (effective cause). Preconditions include:
- A known original ruling
- An identified effective cause
- Similarity in the new issue
B. Examples
Alcohol is prohibited due to its intoxicating effect; based on this, narcotics are also prohibited through Qiyas.
C. Role in Expanding Islamic Law
Qiyas enables jurists to address contemporary issues not explicitly mentioned in the primary texts, thus maintaining the dynamic nature of Shariah.
Detailed Explanation of Ijma
A. Historical Development
Ijma gained prominence during the time of the rightly guided caliphs. It served as a method to stabilize the growing Muslim polity after the Prophet's death.
B. Binding Nature
Ijma acts as a divine safeguard, for the Prophet (PBUH) said, "My Ummah will never agree upon misguidance." (Sunan Ibn Majah)
C. Examples
- The consensus on 20 Rakats of Tarawih under Caliph Umar
- Compilation of the Quran under Caliph Uthman
Detailed Explanation of Ijtihad
A. Definition and Preconditions
Ijtihad is the exertion of reasoning by a qualified scholar (Mujtahid) to derive rulings for new situations. A Mujtahid must master Arabic, Quran, Hadith, and Qiyas and have deep legal insight.
B. Types of Ijtihad
- Individual Ijtihad (by scholars like Imam Abu Hanifa)
- Collective Ijtihad (modern juristic councils)
C. Contemporary Relevance
Modern Ijtihad addresses issues like:
- Bioethics (organ donation, cloning)
- Financial systems (Islamic banking)
- Technological dilemmas (AI, surveillance)
Ijtihad allows Islam to provide divine solutions to ever-evolving societal needs while remaining within the framework of revelation.
Critical Analysis
While Quran and Sunnah provide eternal guidance, the real strength of Islamic law lies in its flexibility through Ijma and Ijtihad. However, contemporary Islamic scholarship faces a decline in qualified Mujtahideen and overdependence on classical interpretations. A revival of Ijtihad, done responsibly, can bridge the gap between revelation and reality. Furthermore, greater emphasis should be placed on collective Ijtihad through qualified juristic bodies to address global challenges facing the Muslim Ummah today.
Conclusion
The four fundamental sources of Islamic law ensure the comprehensiveness, consistency, and adaptability of Shariah. While the Quran and Sunnah offer the divine foundation, Ijma and Qiyas enable jurists to extend legal rulings to emerging realities. Particularly, Ijma safeguards communal unity, and Ijtihad revitalizes Islamic law across generations. Together, they form a holistic and timeless legal framework that can guide both individual conduct and collective governance in accordance with divine will.