Hadith Sciences

The chain of narrators

The chain of transmitters that carries a report back to its source — “so-and-so from so-and-so from the Prophet ﷺ.” Examining the isnād is how authenticity is judged.

The text/content

The actual wording of the report — the words of the Prophet ﷺ (or Companion) that the isnād conveys.

A layer/generation of narrators

A generation-layer of transmitters sharing an era and teachers — the framework of the ṭabaqāt (biographical) literature.

A high (short) chain

An isnād with fewer narrators between the collector and the Prophet ﷺ — prized because fewer links means fewer chances of error.

Accepted

The umbrella for reports admissible as evidence — the ṣaḥīḥ and the ḥasan (each either li-dhātihi or li-ghayrihi). A report is “accepted” when the conditions of soundness are met to the required degree.

Rejected

The umbrella for reports not admissible as evidence — the ḍaʿīf (in its degrees) and the mawḍūʿ. Rejection is due to a missing condition of acceptance: a break in the chain, or a discredited narrator.

Sound / authentic

A hadith with a connected isnād of upright (ʿadl), precise (ḍābiṭ) narrators, free of irregularity (shudhūdh) and hidden defect (ʿilla). The highest grade of acceptance.

Sound in itself

A hadith sound by its own isnād — it meets all five conditions of ṣaḥīḥ (connected chain, upright and precise narrators, no shudhūdh, no ʿilla) without needing outside support.

Sound by corroboration

A ḥasan li-dhātihi report that rises to ṣaḥīḥ because it is corroborated by one or more chains of equal or greater strength.

Good

Like ṣaḥīḥ in every condition except that the precision (ḍabṭ) of a narrator is lighter. Accepted and usable as evidence.

Good in itself

Good in itself — like ṣaḥīḥ in every condition except that a narrator’s precision (ḍabṭ) is a degree lighter. Accepted as evidence.

Good by corroboration

A ḍaʿīf report whose weakness is light (not from lying or grave error) that is raised to ḥasan by another chain or a corroborating witness (shāhid).

Weak

A hadith that fails to meet a condition of ṣaḥīḥ or ḥasan (a break in the chain, or a criticised narrator). Weakness has degrees.

Very weak

Severely weak — its chain contains a grave defect (e.g. a narrator accused of lying, or a matrūk narrator). Such weakness is not repaired by corroboration and cannot rise to ḥasan li-ghayrihi.

Fabricated

A forged report falsely attributed to the Prophet ﷺ. It is not a “weak hadith” but a fabrication, and may not be related except to expose it.

Mass-transmitted

Reported at every level by so many narrators that their collusion on a lie is inconceivable. It yields certain knowledge (ʿilm yaqīnī).

Solitary report

Any report not reaching the level of mutawātir. The majority hold a ṣaḥīḥ āḥād report obligates action (and, per many, knowledge).

Well-known

A report with at least three narrators at each level, but below the threshold of mutawātir.

Scarce (two chains)

A report that at no level has fewer than two narrators.

Single-narrator

A report narrated by a single transmitter at some point in the chain.

Follow-up (same wording)

A supporting chain in which another narrator agrees with the original narrator in reporting the same wording — corroboration that can raise a report from ḥasan to ṣaḥīḥ li-ghayrihi.

Witness (similar meaning)

A supporting report of the same meaning narrated by a different Companion — a “witness” that strengthens the original, e.g. lifting ḍaʿīf to ḥasan li-ghayrihi.

Cross-checking chains

The scholar’s process of searching the other chains of a report to find any mutābiʿ or shāhid — i.e. how corroboration is actually established.

Raised to the Prophet ﷺ

A statement, act, or tacit approval attributed to the Prophet ﷺ himself — whether the chain is connected or not.

Traced to a Companion

A report attributed to a Companion (ṣaḥābī) — their saying or deed — not raised to the Prophet ﷺ.

Traced to a Successor

A report attributed to a Tābiʿī (Successor) — their saying or deed. (Distinct from munqaṭiʿ, a chain-defect.)

Sacred hadith

A report the Prophet ﷺ relates from his Lord: its meaning is from Allah, its wording from the Prophet ﷺ. It is not part of the recited Qurʾān.

Supported & connected

A marfūʿ hadith whose isnād is connected from the collector all the way to the Prophet ﷺ.

Connected

A chain in which every narrator genuinely heard the report from the one above — no gaps.

Successor → Prophet ﷺ (Companion omitted)

A Tābiʿī attributes a report directly to the Prophet ﷺ, omitting the Companion. Its acceptability is debated among the schools.

Broken chain

A chain with a single narrator dropped somewhere in the middle (not at the start, and not two in a row).

Two+ consecutive omitted

A chain from which two or more consecutive narrators have fallen out. A severe form of discontinuity.

Suspended (start omitted)

One or more narrators omitted from the beginning of the isnād (the collector’s own end) — e.g. some chains in Ṣaḥīḥ al-Bukhārī.

Concealed defect (tadlīs)

The narrator conceals a flaw in the isnād — e.g. reporting from a contemporary he did not actually hear this from, in a way that implies he did.

Narrated with “ʿan” (from)

A chain conveyed with the word “ʿan” (“from so-and-so”) without stating explicit hearing. It is treated as connected if the narrator is free of tadlīs and a meeting between the two is established.

Uniformly-chained

A chain in which every narrator shares one recurring state, word, or action in transmitting — e.g. each saying “I heard” or reporting a gesture identically.

Hidden defect

A subtle, hidden flaw that undermines a report which outwardly appears sound. Detecting ʿilal is the most demanding branch of the science.

Defective (has an ʿilla)

A hadith found to carry a hidden ʿilla despite an outwardly sound isnād.

Irregular

A reliable narrator contradicts narrators who are more reliable or more numerous. The odd version is rejected as shādhdh.

Denounced

A weak narrator contradicts the reliable ones. Stronger in defect than shādhdh.

Interpolated

Wording not belonging to the hadith is inserted into its matn or isnād — often an explanatory phrase mistaken for the Prophet’s ﷺ words.

Inverted / switched

A substitution or reversal in the isnād or matn — e.g. swapping a narrator’s name or transposing wording.

Shaky (conflicting)

Reported in conflicting ways of roughly equal strength that cannot be reconciled or preferred — the confusion weakens it.

Misread (dots/letters)

A word altered by misreading the dots or letters (e.g. reading “بشير” as “بشر”). A slip of the pen or eye that changes meaning.

Critique & authentication of narrators

The science of appraising narrators — declaring them reliable (taʿdīl) or criticised (jarḥ) — on which the grading of every hadith rests.

Trustworthy

A narrator who is both upright in character (ʿadl) and precise in memory (ḍabṭ) — the top tier of reliability.

Truthful (slightly less precise)

A narrator known for honesty but with some shortfall in precision — his hadith is typically ḥasan.

Abandoned

A narrator whose reports are discarded — accused of lying, or gravely unreliable.

Uprightness of the narrator

The first half of acceptability: a Muslim, of sound mind and maturity, free of open sin and of anything that publicly compromises his dignity. Uprightness concerns character, not memory.

Precision in memory or book

The second half: that the narrator preserved what he heard — either by memory (ḍabṭ al-ṣadr) or in a guarded written copy (ḍabṭ al-kitāb). Precision, unlike uprightness, admits of degrees, and it is where most narrators are ranked.

The ranked ladder of verdicts

Critics’ verdicts are not a yes/no switch but a ladder — roughly six ascending ranks of praise (thiqa thiqa, thiqa, ṣadūq, lā baʾsa bihi, shaykh, ṣāliḥ al-ḥadīth) and six descending ranks of criticism (layyin, ḍaʿīf, matrūk, muttaham, kadhdhāb, waḍḍāʿ). Reading the exact word matters more than reading the tier.

Criticism with a stated reason

Criticism that names its cause (“he confuses chains”, “he narrates from those he never met”). The rule of the critics is that explained criticism outweighs unexplained praise — and unexplained criticism does not outweigh established praise.

Declaring a narrator reliable

The positive verdict: a critic states that a narrator is upright and precise. It may be explicit, or implicit — as when an imam known to narrate only from the trustworthy transmits from him.

Unknown

A narrator whose identity or reliability is unestablished — either unknown as a person (ʿayn) or unknown in condition (ḥāl).

Unknown as a person

A narrator from whom only one student ever narrated, and whom no critic described. Neither his identity nor his state is established.

Known as a person, unknown in state

Two or more students narrated from him, so he is a known person, but no critic declared him reliable or weak. Outwardly upright, inwardly unassessed — the jurists differ over accepting him.

One whose memory later failed

A reliable narrator whose memory deteriorated late in life — through age, illness or the loss of his books. His earlier students’ narrations are accepted; those who heard from him after the ikhtilāṭ are not, which is why the rijāl books record *when* each student heard.

Accused of lying

One not proven to have forged hadith, but known for untruth in ordinary speech, or narrating what is known only from him and contradicts the established. His reports are among the severest weak.

A Companion

One who met the Prophet ﷺ believing in him and died upon Islam. In Sunni method the Companions are not subjected to jarḥ; examination of narrators begins with the generation after them.

A Successor

One who met a Companion as a believer and died upon Islam — the second generation, and the first layer the critics examine narrator by narrator.

Ranks of the hadith scholar

Titles of attainment rather than verdicts on a narrator: the ṭālib begins, the muḥaddith has mastered chains and texts, the ḥāfiẓ commands a vast number of them with their narrators, and the ḥākim (used sparingly) is said to encompass nearly all that was transmitted.

Concealing a link in the chain

A narrator relates from a teacher he did meet something he did not hear from him directly, wording it so as to suggest he did (“ʿan fulān”, “qāla fulān”) while dropping the intermediary.

Disguising the teacher’s name

Naming a real teacher by an unfamiliar kunya, nisba or ancestor’s name so that a weak or little-known shaykh is not recognised. The chain is connected, but the reader is misled about who is in it.

Smoothing a weak link out of the chain

The severest kind: a narrator drops a weak transmitter who sits *between two reliable* narrators, leaving a chain that appears sound throughout. The critics treat it as near-deception, and require an explicit statement of hearing at every level.

A hidden break

A narrator relates from a contemporary he never actually met, in wording that implies he did. It differs from tadlīs precisely in that meeting was never established — which is why the critics ask not only “were they contemporaries?” but “did they meet?”

A Companion reporting what he did not witness

A Companion — often one young at the Prophet’s ﷺ passing — reports an event he did not himself witness, having heard it from another Companion. Since the unnamed link is a Companion, the great majority accept it.

The preserved version

The counterpart of the shādhdh: when a stronger narrator contradicts a weaker one, the stronger narrator’s version is the maḥfūẓ (“preserved”) and the weaker’s is the irregular one.

The recognised version

The counterpart of the munkar: where a weak narrator contradicts the reliable, the reliable narrators’ report is the maʿrūf and his is the munkar.

An addition by a reliable narrator

Extra wording in text or chain reported by one reliable narrator that his equally reliable peers did not report. Not accepted or rejected wholesale: the critics weigh who added it, how many omitted it, and whether the addition conflicts with them or merely supplements.

Altered vowelling

The twin of the muṣaḥḥaf: where taṣḥīf alters the dots of the script, taḥrīf alters the vowels — turning one name or word into another that looks identical unvowelled.

An inserted extra narrator

An extra name inserted into a chain that was in fact connected without it — the mirror image of a dropped link, and detected the same way, by lining the chains up side by side.

Standing alone in a narration

That a narrator is alone in reporting something. Alone is not a defect in itself — a thiqa’s solitary report can be ṣaḥīḥ — but the weaker the narrator and the more public the matter he alone reports, the more the critics suspect an error.

Mass-transmitted in the same words

Mass transmission where the narrators agree on the wording itself — rarer than the maʿnawī kind, since it requires the words, not only the meaning, to be carried by every route.

Mass-transmitted in meaning

Many reports differ in their wording and details yet converge on one shared meaning — as with the numerous separate reports of the Prophet ﷺ raising his hands in supplication.

Solitary at the root of the chain

A report whose entire circulation goes back to a single narrator at the base of the isnād — no one else transmits it from the Companion or Successor in question.

Solitary in a relative sense

Solitary only in a particular respect — the only narration from a given city, or the only route through a given teacher — though the hadith itself is known through others.

A report from a Companion or Successor

In common usage, what is transmitted from the Companions and Successors rather than from the Prophet ﷺ — though some scholars use athar for any transmitted report at all.

Effectively traced to the Prophet ﷺ

A Companion’s statement about something no reasoning could reach — the unseen, the rewards of specific deeds, events of the resurrection — is treated as if traced to the Prophet ﷺ, since he could only have learnt it from him.

One route of the same hadith

One particular chain among several that carry the same text. Gathering all the ṭuruq is the first step of takhrīj: only side by side do the additions, omissions and defects become visible.

A low (long) chain

The opposite of the ʿālī: more narrators stand between the collector and the source. Length is not weakness — a long chain of reliable narrators outweighs a short chain of weak ones.

The collector and the narrator

The rāwī is anyone who passes a report on; the mukharrij is the scholar who records it in his own book with his own chain — which is why we cite “Bukhārī” for a hadith he did not himself hear from the Prophet ﷺ.

Receiving, then passing on

Taḥammul is how a student takes a hadith from his teacher; adāʾ is how he later transmits it. The eight recognised modes are ranked, and the wording a narrator uses is supposed to disclose which mode he used — so the ṣīgha is itself evidence.

Hearing from the teacher directly

The highest mode: the student hears the teacher dictate or recite. Its wordings are the strongest — samiʿtu (“I heard”) and ḥaddathanā (“he narrated to us”).

Reading back to the teacher

The student reads the text aloud to the teacher, who confirms or corrects it. Standard usage marks it with akhbaranā (“he informed us”), and the majority rank it just below samāʿ — Mālik held it equal.

Licence to transmit

The teacher permits the student to transmit a named book or all of his narrations without a full reading. A specific ijāza for a specific book to a specific student is accepted; a blanket licence to unknown persons for unspecified material is not.

Handing over the written copy

The teacher hands the student his own written copy. Coupled with an ijāza it is strong; the bare handing over of a book without permission to transmit is not sufficient for most.

Transmission by correspondence

The teacher writes the hadith out for a student, present or absent. Accepted by the majority when the handwriting is established — the practice of a number of the early imams.

Notification, or bequest of a book

The teacher merely informs the student that a given book is his narration (iʿlām), or bequeaths his copy to him at death or departure (waṣiyya). Both are weak modes, and transmitting by them alone is disputed.

Finding a book without any licence

Coming upon someone’s written narrations with no hearing, licence or handing over. The honest wording is “I found in the handwriting of so-and-so”; it is not a connected chain, and a report known only this way is not treated as heard.

The wordings of transmission

The verbs that disclose how a narrator received a report: ḥaddathanā and samiʿtu for hearing, akhbaranā for reading back, anbaʾanā often for licence, and the ambiguous ʿan — which is why a mudallis’ ʿan is examined so closely.

When the hearing took place

Because a narrator’s precision can change over a lifetime, the rijāl works record not only *from whom* a student heard but *when* — before or after his teacher’s memory failed, and in which city.

A comprehensive collection

A collection covering the whole range of subjects — creed, rulings, conduct, tafsīr, tribulations, virtues and history — rather than legal chapters alone. Ṣaḥīḥ al-Bukhārī and Jāmiʿ al-Tirmidhī are of this kind.

Arranged by legal chapter

A collection ordered on the chapters of fiqh — purification, prayer, zakāt, and onward — containing chiefly marfūʿ reports, so that a jurist can find the evidence for a ruling where he expects it.

Arranged by Companion

A collection ordered by the narrating Companion rather than by subject — everything from Abū Hurayra together, everything from ʿĀʾisha together. Excellent for tracing a narrator, harder for finding a ruling.

Arranged by teacher or name

A collection ordered on the names of the author’s teachers, or of Companions, usually alphabetically — the three Muʿjams of al-Ṭabarānī being the best known.

Chapters mixing marfūʿ with the athar

Ordered by chapter like the Sunan, but deliberately including the statements of Companions and Successors alongside prophetic reports — invaluable for seeing how the early generations actually practised.

A supplement to an earlier collection

A work gathering reports the author holds to meet an earlier collector’s conditions though that collector did not include them — al-Ḥākim’s Mustadrak upon the two Ṣaḥīḥs being the famous case, and one later scholars examined closely.

The same hadiths by the author’s own chains

An author takes the hadiths of an existing book and reaches each of them through his *own* isnāds, meeting the original author somewhere up the chain. It strengthens the original and often yields a higher chain.

A monograph on one narrow topic

A short work gathering everything on a single narrow matter — one narrator’s narrations, or the hadiths on a single act — such as al-Bukhārī’s juzʾ on raising the hands in prayer.

A forty-hadith selection

A selection of forty hadiths on a chosen theme, a genre of teaching literature — al-Nawawī’s Arbaʿūn being the most widely memorised.

An index by opening words

A reference work listing only the opening phrase of each hadith and then, beneath it, all its chains and the books that record it. The classical equivalent of a search index — the starting point of takhrīj.

Books of hidden defects

Works devoted to the subtle flaws in chains that appear sound — the hardest genre in the science, written by the very few who had memorised enough chains to notice the difference between them.

Narrator dictionaries

Biographical dictionaries of the narrators — their teachers, students, cities, death years and the critics’ verdicts on them. Without this genre the chains would be lists of unexaminable names.

Dictionaries of difficult words

Works explaining the rare and obsolete words occurring in hadith — a whole genre arising because a text can be perfectly authentic and still be misread by a later reader.