Ijma‘: Definition, Authority, Four Types and Legal Rulings

1. The third source of legal evidence

After the Qur’an and Sunnah, the textbook examines ijma‘ (juristic consensus). Earlier lessons dealt with the meaning of revelation and the reliability of transmitted guidance. We now ask what authority an agreement among qualified jurists has in a legal matter.

«المبحث الثالث في الإجماع»
The third investigation: consensus.

This lesson first defines consensus and who participates in it, then explains its evidentiary authority and four distinct grades. Not every agreement is technical ijma‘, and the textbook does not assign the same degree of authority to all four forms.

2. The linguistic meaning of ijma‘

«الإجماع في اللغة: الاتفاق»
In language, ijma‘ means agreement.

Agreement means that people share the same position on a matter rather than disagreeing about it. This is the broad linguistic sense; a group agreeing on a practical plan illustrates mere agreement.

Technical ijma‘, however, is not just any group decision. Juristic qualification, belonging to the relevant community, a shared period, and the matter under consideration make the technical meaning narrower. We therefore need the book’s legal definition.

3. The technical definition

«وفي الشريعة: اتفاق المجتهدين من أمة محمد ﷺ في عصر على أمر»
In legal terminology, it is the agreement of the mujtahids of Muhammad’s community ﷺ, in one period, concerning a matter.

The key elements are:
1. Agreement.
2. Participation by mujtahids.
3. Their belonging to the Prophet’s community.
4. Agreement in a given period on a matter.

These qualifications distinguish technical consensus from a public vote or routine committee decision. The book specifically treats the agreement of people qualified in legal reasoning as relevant to its authority.

4. Why qualified jurists matter

The word mujtahids is central. A mujtahid is a jurist qualified to derive legal rulings through knowledge of the sources, the implications of legal texts, and principles of interpretation.

«والمعتبر في هذا الباب إجماع أهل الرأي والاجتهاد»
In this discussion, the consensus of those qualified in legal reasoning and ijtihad is considered.

A ruling is not made authoritative merely because many people favor it. The relevant factor in this technical discussion is informed juristic competence alongside agreement among the qualified participants.

5. Who is not counted as a mujtahid here

«فلا يعتبر بقول العوام والمتكلم والمحدث»
The book does not count the views of ordinary people, a theologian merely as a theologian, or a hadith specialist merely as a hadith specialist, for this particular juristic consensus.

This is a qualification test for legal reasoning, not a dismissal of those disciplines. A hadith expert may possess tremendous knowledge yet lack the specific competence for independent legal deduction.

One person may of course be both a hadith expert and a mujtahid; such a person counts by virtue of the latter qualification. Titles alone do not determine participation.

6. The role of a single period

The definition includes «في عصر»—in one period. It concerns jurists of a particular era agreeing about a matter, not a selective collection of opinions from different centuries.

If all qualified jurists of a period are shown to agree on a ruling, the definition can apply. Yet finding several prominent scholars who adopted the same opinion across centuries does not by itself establish consensus.

This lesson deals with the conceptual grades of ijma‘. Establishing that a particular historical consensus actually occurred is a separate evidentiary task.

7. Consensus after the Prophet’s death

In explaining its authority, the textbook locates the consensus of this community after the Prophet’s death ﷺ. During his lifetime, matters could be referred to his authoritative, revelation-guided instruction.

«فإجماع هذه الأمة بعد ما توفي رسول الله ﷺ في فروع الدين حجة قطعية موجبة للعمل»
Thus, after the Prophet’s death ﷺ, the community’s consensus in branches of religion is a definitive proof requiring action.

«فروع الدين» here concerns practical rulings of religious law. The author is not turning ordinary administrative agreement into binding juristic consensus.

8. Consensus versus a majority opinion

Suppose ten qualified jurists discuss a matter: eight support one ruling and two support another. This is a majority view, not unanimous agreement. Eight out of ten is not technical ijma‘ merely because the majority is large.

Consensus becomes relevant when all qualifying jurists of the pertinent era agree and the agreement is established.

Compare:
Majority: some qualified jurists still dissent.
Unanimity: no dissent remains among those counted.
Proof: the claimed agreement must be historically established.

Many supporters is therefore not synonymous with a proven ijma‘.

9. Why consensus is treated as binding

«حكمه: هو حجة كالحديث»
Its ruling is that it serves as a proof, like hadith.

The book is establishing consensus as an evidentiary source in jurisprudence. A properly established ijma‘ is not merely optional advice or a preference for a popular position.

The phrase “like hadith” does not turn consensus into a prophetic report. Hadith transmits Prophetic guidance, while ijma‘ is established agreement among qualified jurists. Their origins and methods of verification differ, though each can support legal reasoning.

10. Qur’anic basis: the path of believers

For its Qur’anic evidence, the book cites Qur’an 4:115, which warns about opposing the Messenger and following a path other than that of believers.

«وَيَتَّبِعْ غَيْرَ سَبِيلِ الْمُؤْمِنِينَ»
And follows a path other than the way of the believers.

The usuli inference is that condemning departure from the believers’ path supports the authority of their established common religious path. This is a legal inference from the verse; the full context also concerns opposition to the Messenger ﷺ.

11. A reported support for ijma‘

The source also cites a report in support of consensus:
«لا يجمع الله هذه الأمة على ضلالة أبداً»
Allah will never unite this community upon misguidance.

The author uses this as transmitted support for the proposition that an authoritative, established agreement of the community does not rest on error.

Methodological caution: citing a report in a textbook and independently evaluating its chains are different matters. This lesson explains the source’s legal argument; it does not purport to assess every transmission route or hadith grading.

12. A statement attributed to Ibn Mas‘ud

The textbook also quotes a statement of ‘Abd Allah ibn Mas‘ud (may Allah be pleased with him):
«ما رآه المسلمون حسناً فهو عند الله حسن، وما رأوه سيئاً فهو عند الله سيّئ»
What Muslims regard as good is good before Allah, and what they regard as bad is bad before Allah.

The source presents this statement as supporting consensus. It is to be identified as a Companion’s reported statement, rather than silently attributed as the Prophet’s own hadith.

Nor should it be detached from the technical definition and made to mean that everyday public preferences automatically count as qualified juristic consensus.

13. Consensus in practical legal branches

In the book’s discussion of binding authority, the qualification «في فروع الدين» directs attention to practical legal branches on which qualified jurists agree.

Distinguish two tasks:
Deriving a ruling: interpreting the Qur’an, Sunnah and legal principles.
Establishing consensus: showing that the relevant jurists of that period actually agreed.

Finding a ruling in a respected manual does not, by itself, prove ijma‘. The ruling may be sound, but claiming unanimous agreement is a further evidentiary claim.

14. The four categories of ijma‘

«والإجماع على أربعة أقسام»
Consensus has four categories.

The classification asks who agreed and how the agreement relates to earlier opinions or explicit expression:

1. Companions explicitly agreeing on a ruling for an issue.
2. Some Companions expressing a position while the remainder remain silent.
3. Later jurists agreeing where no prior Salaf position is recorded.
4. Later jurists agreeing on one of the views already held by the Salaf.

The book distinguishes their evidentiary strength and practical implications rather than treating them as identical.

15. First type: explicit Companion consensus

«إجماع الصحابة رضي الله عنهم على حكم الحادثة نصّاً»
The Companions’ explicit agreement on the ruling of an issue that arises.

Here نصّاً (explicitly) concerns clearly stated assent by the participants, not necessarily an explicit verse of the Qur’an. The agreement is shown through positive expression rather than merely lack of objection.

It differs from the second category, in which some Companions speak and others are silent.

16. First type: the textbook’s example

For the first type, the textbook cites the Companions’ agreement on Abu Bakr’s caliphate (may Allah be pleased with him).

«كإجماعهم على خلافة أبي بكر رضي الله عنه»
Such as their consensus concerning the caliphate of Abu Bakr.

The usuli purpose of the example is to illustrate a recognized instance of openly expressed Companion agreement. Detailed historical reconstruction is a separate study.

The distinguishing feature for this category is explicit agreement, not merely the importance of the issue or the size of a majority.

17. Ruling of the first type

«حكمه: هو قطعي بمنزلة آية من كتاب الله تعالى، فيكفر جاحده»
The source calls this type definitive, comparable in evidentiary force to a Qur’anic verse, and assigns disbelief to its denial as a general doctrinal ruling.

“Like a verse” compares evidentiary strength; it does not mean consensus becomes Qur’anic revelation. The book gives this type its strongest degree of authority.

Important limit: Such a general classification in a classical usul text is not permission to declare a particular person an unbeliever. Applying such a judgment to an individual involves distinct conditions and impediments not examined here.

18. Second type: tacit Companion consensus

«إجماع الصحابة بنص البعض وسكوت الباقين، ويقال له: الإجماع السكوتي»
Some Companions expressly state the ruling while the others remain silent; this is called tacit consensus.

The first category involves explicit assent from all, whereas the second involves explicit expression from some and silence from the rest. Silence is thus intrinsic to its definition.

This does not imply that any unexplained silence in ordinary life creates ijma‘. The legal claim still depends on establishing the relevant circumstances of the expressed view and the remaining jurists’ silence.

19. The example of tacit consensus

The book illustrates this category with the Companions’ position concerning fighting those who withheld zakat during Abu Bakr’s rule.

«كإجماعهم على قتال مانعي الزكاة في عهد أبي بكر رضي الله عنه»
Such as their consensus about fighting those who withheld zakat in the time of Abu Bakr.

The usuli point is how the author classifies the historical example: an expressed position by some and silence or lack of objection by others. The brief example should not be taken as a full reconstruction of every historical circumstance.

20. Ruling of the second type

«حكمه: هو قطعي أيضاً ولا يكفر جاحده»
This type too is definitive, but the book does not classify its denial as disbelief.

This distinction is crucial: definitive authority and the classification of denial are separate questions. For the first type the source gives a stronger doctrinal consequence; for the second it does not, despite calling it definitive.

Therefore, the two Companion forms must be distinguished by both how agreement is manifested and the ruling the book attaches to denial.

21. Third type: later consensus on an unaddressed issue

«إجماع من بعدهم فيما لم يوجد فيه قول السلف»
Consensus of those after the Companions concerning a matter for which no view of the early predecessors is found.

«من بعدهم» refers to subsequent qualified jurists. «لم يوجد فيه قول السلف» means that no earlier Salaf position is known on that issue.

One can imagine a new legal problem without a recorded earlier opinion on which later mujtahids agree. That scenario illustrates the definition; it is not being asserted as an actual, documented historical consensus.

22. Third type: knowledge of assurance

«حكمه: هو بمنزلة الخبر المشهور، يفيد الطمأنينة دون اليقين»
Its standing is like a mashhur report: it produces assurance, but not certainty.

The previous level placed mashhur reports within a particular ranking of transmissions. Here the author uses that familiar scale to explain the strength of this later form of ijma‘.

Assurance (itmi’nan) signifies strong evidentiary confidence, while the certainty (yaqin) of the strongest category is not assigned to it. Do not transfer the explicit “definitive” ruling of the second form to this third form.

23. Fourth type: selection among earlier views

«إجماعهم على أحد أقوال السلف»
Their consensus on one of the earlier Salaf positions.

In the third type, no earlier opinion is found. In the fourth, multiple earlier opinions exist, and later jurists agree on one of them.

For illustration, imagine that two views are reported from early jurists and later qualified jurists uniformly adopt one. That shows the formal distinction; no claim is made that a particular issue has historically met the conditions of consensus.

24. Fourth type: duty to act and its place over qiyas

«حكمه: هو بمنزلة خبر الواحد، يوجب العمل دون العلم، ويكون مقدماً على القياس كخبر الواحد»
Its status resembles a solitary report: it obliges action without establishing certain knowledge, and is preferred to qiyas as such a report is.

The difference between requiring action and producing certainty matters. In this ranking a source can require practical compliance without occupying the highest level of conclusive knowledge.

Its priority over qiyas means that the ruling is not set aside merely for analogical deduction. The next chapter introduces qiyas and its conditions.

25. Four forms compared

Review the definition and ruling of each form:
1. Explicit Companion consensus: openly expressed agreement; definitive, with the source’s strongest ruling on denial.
2. Tacit Companion consensus: some speak and the rest remain silent; definitive, but without the first type’s ruling on denial.
3. Later consensus where no early view exists: analogous to a mashhur report; assurance but not certainty.
4. Later consensus on one early view: analogous to a solitary report; action required without certainty and given priority over analogy.

Conclusion: identifying a claimed ijma‘ requires knowing its category and proving that it actually occurred, not merely assigning all claims the same authority.

The following lesson introduces the definition, authority, and conditions of qiyas.