Usul al-Fiqh — Rawzat

The Hierarchy of Sources

Islamic law is not a flat system of rules — it has a clear hierarchy. Higher sources cannot be overridden by lower ones:

The Quran — absolute, infallible, every letter divinely preserved
The Sunnah — binding; explains and supplements the Quran; classified by chain strength (sahih/hasan/da’if)
Ijma’ — binding if established; protects against individual deviation
Qiyas — probable, not certain; requires skilled reasoning

When sources conflict, the higher source prevails. When they supplement each other, the combined body of guidance is richer than any single source alone.

The First Source — Al-Quran

The Quran is the primary and superior source of all Islamic guidance. Its role in law:

Direct commands and prohibitions: “Establish prayer” (2:43), “Give zakah” (2:43), “Do not approach fornication” (17:32), “Prohibited to you is the flesh of dead animals” (5:3).

General principles from which rulings are derived: “Do not cause harm and do not reciprocate harm” (la darar wa la dirar) — derived from multiple Quranic evidences. This principle underwrites enormous swaths of Islamic law.

Muhkamat and Mutashabihat: See [[tafsir-overview]]. Legal rulings are derived primarily from the muhkamat (clear, unambiguous verses); the mutashabihat require interpretation through the muhkamat before yielding legal conclusions.

Naskh (Abrogation): Some earlier Quranic rulings were superseded by later ones within the Quran itself (e.g., the qibla changed from Jerusalem to Mecca; the gradual prohibition of alcohol across multiple stages). Classical scholars compiled extensive lists of abrogated and abrogating verses.

The Second Source — Al-Sunnah

The Sunnah is the collected practice, words, and tacit approvals of the Prophet Muhammad (SAW). Its authority is grounded in the Quran itself:

“And whatever the Messenger gives you — take it; and what he forbids you — refrain from it.” (59:7)

“Whoever obeys the Messenger has obeyed Allah.” (4:80)

The Sunnah’s functions relative to the Quran:

Bayan ta’kid (confirmation): Re-affirms what the Quran establishes (prayer, zakat)
Bayan tafsil (specification): Details what the Quran mandates generally (the Prophet’s prayer = detailed specification of 2:43’s “establish prayer”)
Bayan takhsis (limiting a general ruling): The Quran generally prohibits carrion (5:3), but the Sunnah permits locusts and fish found dead (mayta al-bahr)
Bayan ta’sis (establishing independent rulings)**: Some prohibitions exist only in the Sunnah: combining a woman and her paternal aunt in marriage, wearing gold rings for men

The science of hadith criticism (‘ulum al-hadith) was developed precisely to evaluate the reliability of Sunnah narrations. See [[hadith-sciences]].

The Third Source — Ijma’ (Consensus)

Ijma’ (إِجمَاع — consensus, agreement) is the collective agreement of qualified Muslim scholars of a given generation on a legal ruling. Its authority rests on the prophetic hadith: “My ummah will not agree upon error.” (Ibn Majah, Abu Dawud — with scholarly debate on its precise chain, but accepted as establishing the principle).

Key principles:

Ijma’ must be of qualified scholars (mujtahidin), not just any Muslims
Once established, ijma’ is binding and cannot be overturned by subsequent individual opinion
The most certain ijma’ is that of the Companions (Ijma’ al-Sahabah)
The famous “five universally agreed-upon prohibitions” (killing, zina, theft, consuming alcohol, apostasy) represent areas where Quranic command + Sunnah + ijma’ all converge

The practical challenge: confirming ijma’ across the entire scholarly community is difficult. Many rulings attributed to ijma’ are better described as shuhrat (widespread agreed practice) rather than verified formal consensus.

The Fourth Source — Qiyas (Analogical Reasoning)

Qiyas (قِيَاس — analogy, measurement, comparison) extends an established legal ruling to a new situation by identifying the underlying cause (‘illa) that generated the original ruling and then applying it to the new situation that shares the same cause.

Structure of valid qiyas:

Al-Asl (original case with a Quranic/Sunnah ruling): Drinking khamr (grape wine) is prohibited
Al-Far’ (new case to be evaluated): What about nabidh (date wine)?
Al-Hukm (ruling from original): Prohibition
Al-‘Illa (underlying cause): Intoxication (iskar)

If date wine causes intoxication, the ‘illa is shared, and the ruling extends: it is also prohibited. This is the reasoning behind the principle “every intoxicant is khamr, and every khamr is prohibited.” (Muslim)

Limits of qiyas: only applies where the ‘illa is clearly identifiable; does not apply to ‘ibadat (acts of worship) which are established by divine command, not discernible rationale.

The Ismaili Approach — ‘Aql and Ta’wil

The Ismaili tradition grounds legal derivation differently: the Imam of the Age is the living, authoritative interpreter of both the Quran and the Sunnah. The zahir (exoteric law) is supplemented and interpreted through the batin (esoteric meaning) via ta’wil. The primary additional source is ‘aql (reason/intellect guided by walayah), and the living hujja (proof/imam or da’i) is the human chain through whom authentic interpretation flows.

This means that Ismaili fiqh centers not on the four-source Sunni framework but on the relationship between the zahir of the Quranic/Sunnah texts and the ta’wil provided by the Imam or Da’i. See [[tawil-esoteric-interpretation]] and [[dai-al-mutlaq-institution]].

Usul al-Fiqh — The Sources of Islamic Law: Quran, Sunnah, Ijma', and Qiyas