Sources of Legal Theory and Introduction to Specific and General Expressions

1. The field of legal theory

Uṣūl al-fiqh studies the overarching principles and legal proofs by which juristic rulings are established. Fiqh asks what the ruling is in prayer, trade, or marriage. Legal theory asks how that ruling is inferred from evidence.

Does an imperative expression indicate obligation? Does a term refer to one specified subject or encompass many individuals? These are questions of legal theory.

Its purpose is not simply to memorize rulings, but to understand textual indication, the ordering of proofs, and disciplined legal inference.

2. Ruling and evidence

A juristic ruling is distinct from a principle of legal inference. Whether a transaction is permissible is a particular ruling. Interpreting the language of a proof, evaluating its generality, and determining how analogy operates are methodological tasks.

For instance, a stated number in a scriptural text raises questions about its precise meaning and whether another proof can affect it. Translation alone does not settle the status of the evidence.

Legal theory therefore concerns practical rulings while focusing on the reasoning used to establish them.

3. The four principal sources

أربعة: كتاب الله تعالى، وسنة رسوله، وإجماع الأمة، والقياس
The four sources are the Book of Allah, the Sunnah of His Messenger, consensus, and analogy.

These are not merely four labels. Their authority, methods of interpretation, and relationship to other evidence form the structure of legal inference.

The Qur'an and Sunnah supply scriptural evidence; consensus concerns agreement among qualified jurists; and analogy extends an established ruling to a new case through a legally effective common cause. Each operates under its own conditions.

4. The Qur’an as the first source

كتاب الله تعالى
The Book of Allah, the Qur'an, is a foundational source of legal rulings. Understanding its legal language requires asking what a term denotes, whether it has general or specific scope, and what kind of ruling its wording establishes.

A numerical expression may establish a definite quantity, while another word may cover many persons or only a defined class.

The discussion of Qur'anic legal evidence begins with these verbal distinctions because the indication of the wording must be understood before a legal conclusion is drawn.

5. The Prophetic Sunnah

سنة رسوله
The Prophetic Sunnah is the second foundational source. Statements, acts, and tacit approvals attributed authentically to the Prophet ﷺ are studied to determine the guidance they provide.

A narration may explain a wider provision, demonstrate its practical implementation, or convey an independent instruction. Establishing a report's transmission and interpreting its language are distinct scholarly tasks.

An important methodological caution is that reports cannot be treated identically without considering their evidentiary status, wording, and context.

6. Consensus

إجماع الأمة
Consensus is a legally qualified agreement of the relevant jurists on a matter. It is not simply an individual's opinion or a widespread social custom.

A claim of consensus requires examination of who agreed, the scope of the issue, and whether a recognized disagreement is established. Widespread acceptance alone does not automatically demonstrate technical consensus.

Consensus concerns authoritative agreement; analogy, in contrast, relates a new case to an established ruling through a shared effective cause.

7. Analogy and inference

القياس
Analogy relates a new case to a case whose ruling is already established because both share a legally effective ʿillah (effective cause). A superficial resemblance is not enough.

The aṣl is the original case, the farʿ the new case, and the ʿillah the feature on which the extension of the ruling depends.

A sound analogy requires examining the textual ruling and the operative cause before applying it. It is not unrestricted speculation that overrides established wording.

8. Why verbal indications come first

ليعلم بذلك طريق تخريج الأحكام
So that the method of deriving legal rulings becomes known.

The structure of words is not merely a literary concern in jurisprudence. Generality, specification, a fixed number, or a condition may change the reach of a ruling. First determine the denotation of the expression.

For example, “Zayd” can pick out one individual, whereas “Muslimūn” is a plural that encompasses a group. Treating them as if they had identical scope would distort the inference.

9. Specific and general expressions

فصل في الخاص والعام
A section on specific and general expressions.

The khāṣṣ (specific expression) denotes a determined meaning or referent individually. The ʿāmm (general expression) encompasses multiple individuals within its scope. Both have determinate verbal meanings, but their reach differs.

“Zayd” denotes a particular individual, while “Muslimūn” can encompass a group of Muslims. Determining this verbal scope helps identify how broadly a stated ruling applies.

10. The definition of khāṣṣ

فالخاص: لفظ وضع لمعنى معلوم، أو لمسمى معلوم على الانفراد
A specific expression is a word assigned to a known meaning or known referent individually.

Lafẓ is the expression; waḍʿ is its linguistic assignment; maʿlūm indicates a determined sense or referent; and ʿalā al-infirād marks its individual denotation rather than an open-ended collection of persons.

Specific does not mean only a proper personal name. In this classification, a named type or genus can also count as a specific expression.

11. Specification of an individual

في تخصيص الفرد: زيد
“Zayd” illustrates specifying an individual.

When the name refers to a known person, it denotes that particular individual, not all people. Many persons may share the name, but context determines the intended bearer.

For instance, “Zayd is present” predicates presence of a particular individual. It does not mean that everyone is present. Individual determination is central to this use of khāṣṣ.

12. Specification of a type

وفي تخصيص النوع: رجل
“Rajul” (man) illustrates specification of a type.

A specific expression is not necessarily a person's proper name. “Rajul” identifies a determined type of meaning, rather than an unrestricted and undefined subject.

The classification of a type must not be confused with a plural expression such as “al-rijāl” when it is used to range over its members. Identifying a type and applying a ruling to an entire group are different matters.

13. Specification of a genus

وفي تخصيص الجنس: إنسان
“Insān” (human being) illustrates specification of a genus.

The word denotes a defined generic meaning distinct from other kinds. Being specific in this classification concerns assignment to a definite concept; it does not mean that only one person can instantiate the concept.

The sequence “Zayd,” “rajul,” and “insān” exemplifies an individual, type, and genus. The purpose is to explain established meanings and not to treat all three as proper names.

14. Comparing the three illustrations

Individual — Zayd: identifies a particular person.
Type — rajul: denotes a determined kind.
Genus — insān: denotes a defined generic concept.

Their levels of reference differ, yet each illustrates a definite lexical meaning. The words “maʿlūm” and “ʿalā al-infirād” in the definition bring this feature into focus.

A text naming Zayd does not automatically include every human being. General application needs appropriate linguistic or evidentiary grounds.

15. The ruling attached to the specific

وحكم الخاص من الكتاب: وجوب العمل به لا محالة
The ruling of a specific expression in the Qur'an is that it must be acted upon.

Where a specific expression clearly denotes its meaning, its established indication is not treated as a matter of personal preference. The text requires compliance with what it determines.

The qualification matters: this discussion concerns the Qur'anic khāṣṣ and what its lexical indication establishes. If another word in the same passage is independently ambiguous, that ambiguity must be examined separately.

16. Specific wording, solitary reports, and analogy

فإن قابله خبر الواحد أو القياس، فإن أمكن الجمع بينهما بدون تغيير في حكم الخاص يعمل بهما
If a solitary report or analogy appears to conflict with a specific Qur'anic expression, both are acted on when they can be reconciled without altering the ruling of the specific expression.

Reconciliation of proofs means assigning each proof its proper effect rather than unnecessarily discarding one. An apparent difference does not always amount to a true contradiction.

وإلا يعمل بالكتاب ويترك ما يقابله
Otherwise the Qur'anic indication is followed, and the opposing proof is set aside at that point.

This is the stated rule for the specific Qur'anic expression vis-à-vis a solitary report or analogy; it should not be indiscriminately applied to every type of evidentiary conflict.

17. Qur’anic example: three qurūʾ

وَالْمُطَلَّقَاتُ يَتَرَبَّصْنَ بِأَنْفُسِهِنَّ ثَلَاثَةَ قُرُوءٍ
Divorced women shall wait concerning themselves for three qurūʾ. (Qur'an 2:228)

The word thalāthah (three) denotes a fixed number. As a numerical expression it is specific: two or four cannot simply be substituted without evidence.

The exactness of the number and the interpretation of “qurūʾ” are distinct questions. A fixed numerical expression does not automatically remove every ambiguity from all neighboring terms.

18. A definite number, a disputed referent

Thalāthah determines the number three. The interpretation of qurūʾ has been disputed between menstrual periods and periods of purity. The count and the nature of the counted period are therefore separate questions.

A disagreement about “qurūʾ” does not by itself make the number three uncertain. Confusing these questions would erase the very distinction the rule of khāṣṣ is meant to establish.

A definite indication on one component of a legal text does not mean that every detail of the full legal issue has already been settled.

19. The definition of ʿāmm

والعام: كل لفظ ينتظم جمعاً من الأفراد
A general expression is one that encompasses a plurality of individuals.

The verb yantaẓim conveys the inclusion of individuals within the expression's scope. The statement is not limited to a single specified person; the term can range over many.

Generality does not depend on how many letters or words an expression contains. The decisive matter is whether its denotation identifies a determinate concept individually or encompasses multiple members.

20. Verbal plurality as generality

إما لفظاً كقولنا: مسلمون، ومشركون
Or through verbal form, as in “Muslimūn” and “Mushrikūn.”

These expressions visibly take plural forms and denote groups of people. The plurality is apparent in the word's morphology.

In a complete legal context, definiteness, indefiniteness, and other qualifications can affect the reach of a plural expression. The introductory point here is simply that some expressions display plurality directly in their verbal form.

21. Semantic inclusion: man and mā

وإما معنى كقولنا: «من» و«ما»
Or semantically, as in “man” and “mā.”

These do not have the outward plural form of “Muslimūn,” yet in suitable constructions they may encompass many persons or things. Thus generality cannot be reduced to a grammatical plural ending.

For example, “man yajtahid yanjaḥ” means “Whoever strives succeeds.” Here “man” is not confined to one named person. “Mā,” depending on its use, may likewise encompass multiple things.

The actual reach of a term is determined by its usage in context.

22. Distinguishing khāṣṣ from ʿāmm

“Zayd” exemplifies a specified individual.
“Rajul” exemplifies a determined type in this classification.
“Muslimūn” shows plurality through verbal form.
“Man” can produce semantic generality in suitable constructions.

To analyze a legal expression, first determine its assigned meaning and use, then whether it specifies a referent or encompasses a plurality. Lexical ambiguity and contextual qualifications, where present, require separate examination.

The authority of clear specific wording is one topic; the reach and possible qualification of general wording is another. Sound inference keeps them distinct.