فِقهُ الإِجمَاعِ الفِقهِيّ — الإِجمَاعُ مَصدَرًا لِلفِقهِ الإِسلَامِيّ: كَيفَ جُرِّرَ الجَذرُ الثَّالِثُ لِأُصُولِ الفِقهِ بِالحَدِيثِ النَّبَوِيِّ وَالخِلَافَاتُ الخَمسُ حَولَ مَن يَعتَدُّ بِإِجمَاعِهِ وَلِمَاذَا يَكَادُ الإِجمَاعُ الحَقِيقِيُّ يَستَحِيلُ بَعدَ القَرنِ الأَوَّلِ الإِسلَامِيّ
Fiqh al-Ijma' al-Fiqhi (فِقهُ الإِجمَاعِ الفِقهِيّ — Jurisprudence of Scholarly Consensus; *ijma'* from *j-m-'*: to agree, gather, unify; the third root [asl] of Islamic jurisprudence after the Quran and Sunna; defined as: the agreement of all qualified Islamic jurists [mujtahidin] of a given era on a specific legal ruling; the Prophetic justification: 'My community will not agree on an error' [Ibn Majah]; 'What the Muslims consider good is good in God's sight' [Musnad Ahmad]; the authority: because the entire community of scholars cannot agree on something wrong [given divine protection of the community], their consensus is binding; five major debates about ijma': [1] whose consensus counts? All Muslims? All scholars? Companions only? Scholars of a specific city [Medina for Malikis]? Scholars of a specific era?; [2] does it require all scholars or just a majority? Majority consensus [ijma' akthari] vs full unanimity [ijma' qat'i]; [3] can consensus be inferred from silence [sukut] — if no scholar objected, does that count as agreement?; [4] can ijma' be broken by later scholars? Most say no: once true ijma' is established, no individual scholar can contradict it; [5] is consensus on derivative matters [furu'] as binding as consensus on fundamentals ['usul]?; the problem of verification: after the first Islamic century, scholars were scattered across a vast empire from Spain to Central Asia; convening and verifying the agreement of all qualified scholars became practically impossible; the response: some jurists accept ijma' of the Companions [generation 1] as certain, ijma' of later generations as probable; some accept regional consensus; some largely abandon ijma' as a practical tool; modern applications: AAOIFI shariah standards and fatwa institutions try to convene major scholars and issue collective rulings — a form of institutionalized ijma' attempt) is the third source of Islamic law whose authority is theoretically profound but practically difficult.
The Prophetic Foundation
The authority of ijma’ rests on Prophetic statements to the effect that God’s community will not agree on an error. The logic: if God protects the community from collective error, then when the community’s qualified scholars all agree, that agreement is reliable.
This is a form of communal epistemology: individual scholars can be wrong; the consensus of all qualified scholars cannot be wrong (in the same fundamental sense).
The Five Debates
1. Whose Consensus?
- Companions only: The early consensus view; after the Companions, later generations cannot bind by their agreement because the Companions had direct knowledge of prophetic practice
- All scholars of any era: Ijma’ can be formed in any generation
- Medinan practice: The Maliki position; the living practice of Medina is a form of continuous Prophetic Sunnah
- All Muslims: Rare view; impractical
2. Unanimity or Majority?
Classical definition requires unanimous agreement. Majority consensus (ijma’ akthari) is persuasive but not legally binding in the strict classical sense.
3. Consensus by Silence?
If a ruling is proposed and no scholar objects publicly, is that ijma’? Some accept this; others require explicit agreement.
The Verification Problem
After the first Islamic century, scholars were spread from Andalusia to Khorasan. Gathering the explicit agreement of every qualified scholar across this geography was impossible. This led most classical jurists to take a practical position: ijma’ of the Companions (verifiable from the hadith literature) is certain and binding; ijma’ of later generations is probable and respected but practically difficult to establish with certainty.
Modern shariah standard-setting bodies (AAOIFI, OIC Fiqh Academy) are attempts to create institutional structures for collective scholarly agreement — a contemporary adaptation of the ijma’ concept.
See also: Fiqh Al Qiyas Al Fiqhi, Fiqh Al Istihsan, Fiqh Al Istislah, Fiqh Al Ijtihad Wal Taqlid, Fiqh Al Ahkam Al Khamsah