Are Authentic Hadith Found Only in the Six Canonical Collections?

Answered by Shaykh Faraz Rabbani

Question

What is the status of hadith graded rigorously authentic (sahih) in collections outside the Six Books (al-Kutub al-Sitta), such as Sahih Ibn Hibban, al-Mustadrak, Musnad al-Bazzar, the works of Tabarani, and the like?

Must we believe in such a hadith?

Are they at the same level of authority as the Six Books?

What about someone who says, “I fully accept the hadith in the Six Books but doubt the authenticity of these other works”?

Answer

In the Name of Allah, Most Merciful, Most Compassionate.

All praise belongs to Allah, and may Allah send blessings and peace upon our Master Muhammad, his folk, and his Companions.

A hadith that has been rigorously authenticated by qualified hadith specialists carries the full authority of the Sunna, whether it is found inside the Six Books or outside them.

The decisive criterion is the soundness of the chain (isnad), the integrity of the text (matn), corroborating evidence, the absence of hidden defects (‘ilal), and the verdict of trained hadith critics.

The book in which a hadith appears is not, in itself, the basis of its acceptance or rejection.

The Foundation: The Chain of Transmission Is Part of the Religion

Abdullah ibn al-Mubarak (d. 181 AH, Allah have mercy on him) gave the science its foundational principle: “The chain of transmission (isnad) is part of the religion. Were it not for the chain, anyone would say whatever they wished” [reported by Imam Muslim in the introduction to his Sahih].

This is the discipline the hadith masters refined across the centuries.

They examined every narrator, traced every chain, and weighed every wording.

The result is a scholarly inheritance unmatched in human history, built to preserve the words of the Messenger of Allah (Allah bless him and give him peace) for every generation.

The Six Books are very important to this inheritance. They are not its boundary.

Bukhari and Muslim Themselves Said They Did Not Gather Every Rigorously Authentic Hadith

The two most authentic works (al-Sahihayn) of Bukhari (d. 256 AH) and Muslim (d. 261 AH, Allah have mercy on them) hold a distinct and elevated status.

Their principal connected hadiths were received by the Umma with collective acceptance, and Sunni scholars treat them as the highest tier of authenticated reports.

Yet Bukhari himself reported that he placed in his Jami’ only what was sound, and left out many other sound reports to avoid excessive length.

Muslim affirmed that he did not place every rigorously authentic hadith he knew in his Sahih [Ibn al-Salah (d. 643 AH), Muqaddima; Suyuti (d. 911 AH), Tadrib al-Rawi].

The two most authentic works were never claimed to be exhaustive. Hadith specialists took this seriously and built the rest of the discipline on it.

Where Hadith Scholars Look for Sound Reports Beyond the Two Most-Authentic Works

Ibn al-Salah directs the student of hadith to seek additional rigorously authentic reports in the relied-upon compilations of the hadith imams: the Sunan of Abu Dawud (d. 275 AH), the Jami’ of Tirmidhi (d. 279 AH), the Sunan of Nasa’i (d. 303 AH), the Sahih of Ibn Khuzayma (d. 311 AH), al-Mustadrak of Hakim (d. 405 AH), the Sunan of Daraqutni (d. 385 AH), and others.

The condition is precise. An authoritative imam must have explicitly graded the report rigorously authentic, or the book itself must have been stipulated by its author to contain only rigorously authentic material. [Ibn al-Salah, Muqaddima]

Imam Iraqi (d. 806 AH, Allah have mercy on him) refines this in his Sharh al-Tabsira wa al-Tadhkira.

An additional rigorously authentic hadith is accepted in two cases: where an authoritative imam has explicitly authenticated the report, or where it appears in a work specifically devoted to rigorously authentic material, such as Sahih Ibn Khuzayma, Sahih Ibn Hibban (d. 354 AH), and al-Mustadrak.

He adds the well-known caution that Imam Hakim was more lenient in authentication than later masters.

One does not rely solely on Hakim’s grading; one checks it against the verdicts of subsequent critics, especially Imam Dhahabi (d. 748 AH, Allah have mercy on him) [Iraqi, Sharh al-Tabsira].

Not Every Hadith in the Four Sunan Is Rigorously Authentic

The matter has a second face that must be stated with equal clarity.

Outside the two most authentic works, the Four Sunan contain rigorously authentic, sound (hasan), and weak (da’if) reports together. They require a hadith-by-hadith assessment.

Imam Abu Dawud himself explains in his Risala ila Ahl Makka that he marked reports of severe weakness in his Sunan, and that what he left without comment is “suitable” (salih), with some reports stronger than others.

This term does not automatically mean rigorously authentic in the strict sense. [Dr. Ahmad Ma’bad]

Distinguishing Between the Sound and Rigorously Authentic: Imam Tirmidhi’s Valuable Role

Imam Tirmidhi’s Jami’ is a foundational work for distinguishing sound (hasan) from rigorously authentic (sahih), and Tirmidhi marks the grade of his reports throughout.

Imam Sakhawi (d. 902 AH, Allah have mercy on him) observes that calling the Five Books or Six Books “rigorously authentic” without qualification is explicit looseness (tasahul), since they include reports the masters describe as weak or even denounced (munkar). [Sakhawi, Fath al-Mughith]

Shaykh al-Islam al-Hafidh Ibn Hajar (d. 852 AH, Allah have mercy on him) notes that the Sunan of Ibn Maja  (d. 273 AH), while useful and important, contains a number of very weak and denounced reports.

Imam Nasa’i’s Sunan is regarded as the strongest of the Four Sunans, though not as a book restricted only to rigorously authentic hadith.

“Sihah Sitta” Is a Loose Conventional Title, Not a Technical Grading

This clarifies the expression “Sihah Sitta” (“the Six Rigorously Authentic Works”).

It is a conventional title for the six canonical Sunni collections, common in cataloging, popular speech, and Indo-Persian and Urdu scholarship. It does not mean, and was never intended to mean, that every report in all six books is technically rigorously authentic.

In the strict technical sense, only the works of Bukhari and Muslim are “Sahih”. The other four require individual grading.

Ibn al-Salah explains the origin of the looser usage: some earlier scholars folded the sound (hasan) category under the rigorously authentic (sahih) because the sound is usable as legal proof, which is why “sahih” language was sometimes applied to Tirmidhi or Nasa’i.

A More Careful Expression for the Six Books

The careful expression is this. The Six Books are the central canonical hadith collections of Ahl al-Sunna, but they neither contain all sound hadith nor are all reports in the Four Sunan rigorously authentic.

“Sihah Sitta” is valid only in a loose, general, canonical sense.

Haythami’s Majma’ al-Zawa’id: Up to Half of a Major Collection Beyond the Six Books Is Sound

A useful illustration is Majma’ al-Zawa’id wa Manba’ al-Fawa’id of Imam Nur al-Din al-Haythami (d. 807 AH, Allah have mercy on him).

He gathered the “additional” hadith (known as al-zawa’id), those not found in the Six Books, from six primary sources: the Musnad of Imam Ahmad ibn Hanbal (d. 241 AH), the Musnad of Abu Ya’la (d. 307 AH), Musnad al-Bazzar (d. 292 AH), and the three Mu’jams of Tabarani (d. 360 AH): al-Kabir, al-Awsat, and al-Saghir.

The collection runs to roughly 18,700 hadith. Scholars estimate that half of these are rigorously authentic or sound, whether on their own merits or through corroboration.

The remainder varies from weak to very weak. And it is well-established that weak hadiths are considered with supporting evidence.

This single example makes the point concrete. Many thousands of rigorously authentic and sound hadith exist outside the Six Books, transmitted by reliable narrators and authenticated by hadith specialists across the centuries.

To dismiss them as a class would be to discard a major portion of the Sunna.

The Authority of a Hadith Does Not Depend on Its Container

Belief in the Prophet (Allah bless him and give him peace) entails affirming the truth of whatever has been rigorously transmitted from him.

When a hadith has been established through sound transmission and the verdict of trained critics, it must be accepted regardless of the book that recorded it.

A rigorously authentic hadith from Sahih Ibn Hibban or from al-Mu’jam al-Kabir of Tabarani, when its authentication has been confirmed by qualified critics, holds the same probative weight as a rigorously authentic hadith from Bukhari or Muslim.

To accept the one and reject the other is to follow the book’s cover rather than the science that grades it.

Why a Sahih Hadith Outside Bukhari and Muslim Can Be Stronger Than One Inside Them

There is one further nuance that must be stated with precision.

Hadith found in the works of Bukhari and Muslim enjoy the Umma’s collective reception (talaqqi bi’l-qabul), which gives them a uniquely high standing in Sunni scholarship.

Yet this collective reception is not a ceiling. A rigorously authenticated hadith outside the two most authentic works can, in principle, be stronger than a particular hadith inside them, when the strength of its chains, the depth of its corroboration, and the absence of any defect make it so. The hadith specialists discussed cases exactly like this. [Tahanawi, Qawa’id fi Ulum al-Hadith, with notes from Abu Ghudda]

What ultimately matters is the strength of the narration itself, as judged by the hadith specialists, not the binding of the book that records it. [ibid; Qasimi, Qawa’id al-Tahdith]

The Person Who Accepts the Six Books but Doubts the Others

To the person who says, “I fully accept the hadith in the Six Books but doubt the authenticity of these other books,” one responds gently.

The doubt rests on a misunderstanding of how hadith authentication works.

First, not every hadith in the Four Sunan is rigorously authentic, as the authors of those Sunan themselves acknowledged.

Second, there are many rigorously authentic hadiths outside the Six Books, transmitted by the same chains of trustworthy narrators that the Six Books rely on.

Third, the safeguard against fabrication is not the binding of a particular book; it is the rigorous discipline of chain criticism that the hadith masters refined across the centuries.

What is the Right Approach?

The right approach is to rely on the judgments of qualified hadith critics for any specific report one is unsure about, and to consult a trained scholar when one encounters a hadith whose grade is unclear.

The average believer does not need to personally authenticate hadith. They need to know where authentication lives and whom to trust to perform it.

Hadith Is a Pitfall Except for the Jurists: Why Authentication and Understanding Travel Together

Authentication is the first step. Understanding is the next, and it is no less essential. Understanding and interpreting the meaning of hadith is the duty of the legal scholars (fuqaha’) of the Umma.

Sufyan ibn’ Uyayna (d. 198 AH, Allah have mercy on him) put it bluntly: “Hadith is a pitfall except for the jurists.”

A reader who picks up a hadith without the interpretive tools of jurisprudence (fiqh) may take it out of context, miss an abrogating or qualifying report, or apply it where the early scholars knew not to.

Imam Ibn Wahb (d. 197 AH, Allah have mercy on him) once said: “If it were not for Malik ibn Anas and Layth ibn Sa’d, I would have gone astray. I used to think that everything that came from the Prophet (Allah bless him and give him peace) was to be acted upon literally.”

The two jurists taught him that knowing the wording is not the same as knowing the ruling.

Imam Shafi’i (d. 204 AH, Allah have mercy on him) framed the relationship in a single line. Addressing the hadith specialists, he said: “You are the pharmacists, and we are the physicians.”

The pharmacist gathers, preserves, and authenticates the medicines. The physician knows the patient, the dose, the contraindication, and the cure.

This is why the science of hadith and the science of jurisprudence stand together in the Sunni tradition.

Take the authenticated hadith from the masters of transmission, and take its understanding and application from the masters of the schools. Neither stands alone.

Preservation, Following the Sunna, and Understanding in the Religion

The hadith sciences exist to preserve: they preserve the words of the Beloved Messenger (Allah bless him and give him peace) so that the Umma can follow him with confidence in every age.

The point of all this care is not academic. It is to live by the clear calls to worship, virtue, good character, and remembrance that the Prophet brought.

Imam Malik (d. 179 AH, Allah have mercy on him) said it beautifully: “The Sunna is the Ark of Noah. Whoever boards it is saved; whoever lags behind drowns.” [Tarikh Baghdad]

The Prophet himself (Allah bless him and give him peace) tied authentication, understanding, and salvation together in a single saying: “Whomever Allah wishes good for, He gives understanding of the religion.” [Bukhari; Muslim]

To want this good is to take both the authentication of hadith and the understanding of fiqh seriously, under qualified teachers.

Where to Go from Here

Take a course. The sciences of hadith (Ulum al-Hadith) are among the great gifts of this tradition. Learning them transforms how a person reads the Sunna.

SeekersGuidance offers free courses on the hadith sciences, including introductory and intermediate works, taught by qualified scholars in the classical pedagogical tradition. See seekersguidance.org/courses.

Read more. Explore the SeekersGuidance Answers and Articles archive. Search for “hadith sciences,’’ “Sahihayn,” “weak hadith,” and related topics for further reading at every level.

Build a personal library. For classical and contemporary books on the hadith sciences, see the curated selection at Firdous Books (firdousbooks.com); titles not available there are sometimes carried by Mecca Books.

And Allah knows best.

[Shaykh] Faraz Rabbani

Related Answers

Are All the Hadith in Sahih al-Bukhari Authentic? The special status of the two most-authentic works and the technical refinements scholars have noted in a small number of narrations. Anchors the distinction between Bukhari and Muslim on the one hand and the Four Sunan on the other.

What Is the Difference Between a Sahih and a Hasan Hadith? A reader-friendly primer on the grading categories that this answer presupposes. Useful for readers new to the language of the hadith sciences.

Why Are There Differences in Raising the Hands for the Opening Takbir? Shaykh Faraz Rabbani on how genuine differences among the schools rest on authentic hadith reports rigorously transmitted across multiple collections. A concrete example that authenticity and inclusion in a particular book are distinct categories.