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Al-Ijma' — Scholarly Consensus: The Third Root of Islamic Law and Its Binding Authority

الإِجمَاع — إِجمَاعُ العُلَمَاء: الأَصلُ الثَّالِثُ لِلفِقهِ الإِسلَامِيِّ وَحُجِّيَّتُه
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Al-Ijma' (الإِجمَاع — scholarly consensus; from *ajma'a* — to agree, to be unanimous; the unanimous agreement of qualified Muslim jurists of a given generation on a legal ruling) is the third of the four classical roots of Islamic law (usul al-fiqh): Quran → Sunnah → Ijma' → Qiyas. The Quranic basis: *'And whoever opposes the Messenger after guidance has been made clear to him and follows other than the way of the believers — We will give him what he has taken and drive him into Hell.'* (4:115) — 'the way of the believers' is read as the community's consensus. The prophetic basis: *'My community will never agree upon an error.'* (Ibn Majah — weak chain but accepted by content through corroboration) This hadith is the cornerstone of the doctrine: if the qualified scholars of the ummah unanimously agree on something, that agreement cannot be wrong — the community has been protected from error by divine promise.

Definition and Scope

Technical definition: Ijma’ is the unanimous agreement of all mujtahidun (scholars capable of independent legal reasoning) of a given generation after the Prophet’s death on a legal ruling.

Key conditions for binding ijma’:

  1. Must involve ALL qualified mujtahidun — one dissenting opinion breaks ijma’
  2. Must be from a single generation (tabaqah) — not scattered across centuries
  3. Must be on a legal matter — ijma’ on historical facts or theological opinions functions differently
  4. Must occur after the Prophet’s death — during his lifetime, only his opinion mattered

Degrees of ijma’:

Types of Ijma’

1. Ijma’ Sarih (explicit consensus): All scholars actually express their agreement — each one issues the same ruling 2. Ijma’ Sukuti (silent consensus): Some scholars rule one way; others remain silent; silence is taken as agreement

Ijma’ sukuti is weaker and contested — the Shafi’is generally reject it; the Hanafis accept it under conditions.

Relationship to Other Sources

The classical usul schema:

Quran (definitive) → Sunnah (clarifies and supplements) → Ijma’ (confirms and freezes the ruling) → Qiyas (extends to new cases)

Ijma’ has a unique “locking” function: once ijma’ is established on a ruling, that ruling can no longer be revisited by individual ijtihad. It becomes a fixed point in the law.

However, if a new generation of scholars produces new ijma’, the earlier ijma’ can in principle be revised — though scholars dispute whether this is really possible.

The Ismaili Position

In Ismaili jurisprudence, the authority of ijma’ is subordinated to the authority of the living Imam. Since the Imam has direct access to the Prophet’s batin knowledge, community consensus among scholars (who only have zahir knowledge) cannot override the Imam’s guidance. The Ismaili position thus differs fundamentally: the “infallibility” that Sunni scholars attribute to scholarly consensus is attributed in Ismaili theology to the Imam alone.

See also: Fiqh Overview, Fiqh Madhabs, Ijtihad, Qiyas, Isnad, Hadith Sciences, Dai Al Mutlaq Institution

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