Ijma — Scholarly Consensus

Definition

Ijma (إجماع), 'consensus,' is the third primary source of Islamic law after the Quran and Sunnah. It refers specifically to the agreement of qualified scholars (mujtahidun) of a given era on a particular ruling of Islamic law. When the scholars of an age collectively agree on a matter, that agreement carries authoritative weight: it becomes binding on subsequent generations and cannot be overturned by individual ijtihad. The Prophet said: 'My community will not agree upon an error' (narrated by Ibn Majah and others, considered sound by al-Nawawi and many scholars).

Basis in the Quran and Sunnah

The authority of ijma is grounded in multiple texts. The Quran says: 'And whoever opposes the Messenger after guidance has become clear to him and follows a path other than that of the believers — We will leave him in the path he has chosen' (4:115). The phrase 'path of the believers' (sabil al-mu'minin) is taken by many scholars as a textual basis for ijma. Hadith traditions also directly address consensus: 'My community will not agree upon error' and 'What the Muslims consider good is good before Allah' (narrated by Ahmad; though this second narration's grading varies, the principle is supported by other evidence). The practice of the Companions themselves — who resolved questions through collective deliberation, as in Abu Bakr's consultative method — provides historical precedent.

Types of Ijma

Scholars distinguish between types of consensus based on how it is established. Ijma sarih (explicit consensus) occurs when all qualified scholars of an era explicitly affirm a ruling — this is the strongest form. Ijma sukuti (silent consensus) occurs when some scholars express an opinion and others in the same era neither affirm nor deny it — whether this constitutes binding consensus is debated, with the Shafi'i and Hanbali schools generally treating it as a weaker form of evidence. The Maliki school is particularly attentive to the ijma of the people of Medina, regarding the transmitted practice of the city as a form of living consensus with special authority.

Scope and Limitations

Ijma is most confidently established on the great pillars of Islamic practice — the obligation of five daily prayers, the prohibition of wine, the rules of inheritance, and similar foundational matters on which there has never been any recorded scholarly dispute. The further one moves from these well-attested matters, the more difficult it is to claim genuine ijma. Many rulings attributed to ijma are in fact strong scholarly majority positions (jumhur) rather than complete consensus — a distinction of legal significance. Scholars like Ibn Taymiyyah were skeptical of many claimed instances of ijma and argued that genuine, fully verified consensus is narrower than often claimed, though no less binding when established.

Ijma and the Four Schools

The existence of four recognized schools of law (madhabs) means that on most detailed legal questions, differences of opinion exist and no ijma can be claimed. Ijma is most powerful in areas of foundational aqeedah and practice where all schools agree. On matters where the schools differ — the legality of certain contract types, the precise rulings of prayer, details of inheritance — each school follows its own ijtihad, and the differences are recognized as legitimate within the sphere of valid scholarly disagreement (ikhtilaf).