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What is ʿilm al-rijāl — the science of narrators?

Before any hadith could be accepted, its chain had to be validated. The scholars who dedicated their lives to this built a science — and preserved biographies of roughly a million narrators across the first six centuries.

10 passages from 9 books in the library

ʿIlm al-rijāl is the science of examining the narrators in a hadith's chain (isnād) so that a report can be accepted or rejected. Across al-Ghazali's works the verdicts of this science appear constantly: a report carried "with a strong isnad," another judged "good," and others discounted as carrying "a weak isnad," containing "unknown individuals" whom critics "considered weak," or resting on an isnād that is simply "doubtful." The passages also speak of preserving the biographies of the predecessors and scholars — the biographical record on which this verification depends.

Drawn from the classical sources below — in the scholars' own words.

Where the answer comes from

The classical approach.

These passages are drawn from 9 books by Imam al-Dhahabī, Ibn Kathir, and Imam al-Ghazali — part of the classical Sunni tradition that carries over a thousand years of reflection on the Qurʾān, the authentic Sunnah, and the consensus of the early community. Nothing below is a paraphrase. The words are the scholars' own, translated from the original Arabic manuscripts.

Read them closely. If a passage doesn't sit right, open the full book in the library and listen to the chapter around it. Context in the classical tradition is everything.

Cover of Al-Kabā'ir — The Major Sins
Al-Kabā'ir — The Major Sins
Imam al-Dhahabī · Timeless Classics

13th–14th century · Damascus, Syria
Siyar Aʿlām al-Nubalāʾ — the monumental biographical dictionary of Islamic scholarship, from the companions of the Prophet ﷺ through al-Dhahabī's own era. A working-scholar reference used for seven centuries.
More on Imam al-Dhahabī → · Provenance →

  1. "Likewise, loving Ali, may Allah be pleased with him, is part of faith and hating him is part of hypocrisy. The virtues of the companions can only be recognized by reflecting on their conditions, their biographies and their legacies during the life of the messenger of Allah and after his death. They hastened to faith, struggled against the disbelievers, spread the religion, manifested the symbols of Islam, elevated the word of Allah and his messenger and taught the obligatory acts and Sunnah. Without them, we would not have received any part of the religion nor would we have learned any of the obligations or Sunnahs nor"

Cover of Volume 2 — From the Israelite Prophets to Pre-Islamic Arabia
Volume 2 — From the Israelite Prophets to Pre-Islamic Arabia
Ibn Kathir · Al-Bidāya wal-Nihāya

14th century · Bosra, Syria
Monumental history Al-Bidāyah wa al-Nihāyah, the world's most widely read Qurʾanic commentary, and the classical Stories of the Prophets.
More on Ibn Kathir → · Provenance →

  1. "Abu Talib acknowledged the monk's words as divine guidance, entrusted Muhammad to Allah, and returned home. The story of Bahira, al-Suhayli narrated from the biographies of al-Zuhri that Bahira was a rabbi among the Jews. However, the context suggests he was a Christian monk and Allah knows best. Al-Masudi mentioned that Bahira was from Abd al-Qais and his name was Jirgis. In the Book of Knowledge by Ibn Qutayba, it is reported that a voice was heard in the days before Islam proclaiming, indeed the best of the people of the earth are three, Bahira, Riyab ibn al-Bara, al-Shani,"

Cover of Book 34: Poverty and Asceticism
Book 34: Poverty and Asceticism
Imam al-Ghazali · Ihya’ ‘Ulum al-Din

11th–12th century · Ṭūs, Khurāsān
Reviving the inner life of Islam through the Iḥyāʾ ʿUlūm al-Dīn — one of the most influential works ever written in any religious tradition.
More on Imam al-Ghazali → · Provenance →

  1. "The hadith stating "A servant does not complete his faith until his preference for not being known is greater than his desire to be known, and until his preference for little is greater than his desire for abundance" does not have a known isnad. It was mentioned by the author of Al-Firdaws, narrating from 'Ali bin Abi Talhah, as a mursal statement: "A servant does not complete his faith until his preference for little is greater than his desire for abundance, and until his being recognized for the sake of Allah is dearer to him than being recognized for worldly purposes."

Cover of Book 33: Fear and Hope
Book 33: Fear and Hope
Imam al-Ghazali · Ihya’ ‘Ulum al-Din

11th–12th century · Ṭūs, Khurāsān
Reviving the inner life of Islam through the Iḥyāʾ ʿUlūm al-Dīn — one of the most influential works ever written in any religious tradition.
More on Imam al-Ghazali → · Provenance →

  1. "the angel of the right says to the angel on the left, who is under his command, 'Erase this sin until a tenfold reward from his good deeds reaches,' the hadith was reported by al-Bayhaqi in the Shu'ab from the narration of Abu Umamah with a weak isnad using the first wording. It was also narrated at length, in which the angel on the right is in charge over the angel on the left, and it does not include him ordering the angel on the left to erase the sin until a good deed from him reaches," I did not find any basis for this."

Cover of Book 1: The Book of Knowledge
Book 1: The Book of Knowledge
Imam al-Ghazali · Ihya’ ‘Ulum al-Din

11th–12th century · Ṭūs, Khurāsān
Reviving the inner life of Islam through the Iḥyāʾ ʿUlūm al-Dīn — one of the most influential works ever written in any religious tradition.
More on Imam al-Ghazali → · Provenance →

  1. "Consequently, scholars dedicated themselves to the knowledge of the hereafter, devoting themselves entirely and avoiding the responsibility for worldly judgments. They turned to Allah with complete effort, as recounted in their biographies. When the caliphate passed to others, who assumed it... Now, consider these hadiths: The hadith "No people are led astray after guidance except they are granted dispute" is narrated by Tirmidhi and Ibn Majah from Abu Umamah, and Tirmidhi declared it sound and authentic."

  2. "The hadith of Muadh "Seek knowledge for indeed seeking it for Allah's sake is piety... is narrated in length by Abu Sheikh ibn Hibban in "Kitab al-Thawab" and Ibn Abd al-Barr mentioned its isnad is not strong. Regarding intellectual evidence, it is important to understand the virtue and preciousness of knowledge. Unless the virtue is understood intrinsically and its aim is realized, it is impossible to determine if it is a quality of knowledge or other traits."

Cover of Yusha, al-Khidr & Ilyas
Yusha, al-Khidr & Ilyas
Ibn Kathir · Stories of the Prophets

14th century · Bosra, Syria
Monumental history Al-Bidāyah wa al-Nihāyah, the world's most widely read Qurʾanic commentary, and the classical Stories of the Prophets.
More on Ibn Kathir → · Provenance →

  1. "completely objectionable. Ibn Muammar Al-Basri who narrated from Anas was noted by Ibn Hibn and Al-Uqayli as having fabricated most of his narrations. Al-Bukhari described his narrations as having obscure Isnad and Abu Hatim called him extremely weak and obscure. Ibn Adi mentioned that most of what he narrated was about the virtues of Ali and he was considered weak and an extremist in Shiism. Al-Shafi'i recorded in his Musnad that Al-Qasim Ibn Abdul Umar informed him from Jafar Ibn Muhammad."

Cover of Volume 3 — The Sīrah: From the First Revelation to Badr
Volume 3 — The Sīrah: From the First Revelation to Badr
Ibn Kathir · Al-Bidāya wal-Nihāya

14th century · Bosra, Syria
Monumental history Al-Bidāyah wa al-Nihāyah, the world's most widely read Qurʾanic commentary, and the classical Stories of the Prophets.
More on Ibn Kathir → · Provenance →

  1. "gone to Abyssinia in the sixth year of the Prophethood. The details of the Islam of Abu Bakr and Umar, may Allah be pleased with them, are elaborated in their individual biographies and all praise is due to Allah. Our Prophet Muhammad, peace and blessings be upon him, was given the choice between being a prophet king or a servant messenger and chose the latter. In some narrations it is mentioned that he consulted Jibreel who advised humility, leading him to choose to be a servant messenger."

Cover of Book 20: The Book of the Prophetic Character
Book 20: The Book of the Prophetic Character
Imam al-Ghazali · Ihya' 'Ulum al-Din

11th–12th century · Ṭūs, Khurāsān
Reviving the inner life of Islam through the Iḥyāʾ ʿUlūm al-Dīn — one of the most influential works ever written in any religious tradition.
More on Imam al-Ghazali → · Provenance →

  1. "the Prophet ﷺ passed away while his armor was pledged for food for his family, specifically twenty measures of grain. Ibn Majah reports thirty measures of barley with a strong isnad. Al-Bukhari records from Aisha that he passed with his armor pledged to a Jew for thirty measures of barley. "He would mend his sandals, patch his clothes, and serve his household," is reported by Ahmad from Aisha: "He repaired his sandals, sewed his clothes, and worked at home as one of you would."

Cover of The Story of Musa
The Story of Musa
Ibn Kathir · Stories of the Prophets

14th century · Bosra, Syria
Monumental history Al-Bidāyah wa al-Nihāyah, the world's most widely read Qurʾanic commentary, and the classical Stories of the Prophets.
More on Ibn Kathir → · Provenance →

  1. "they were frightened and circulated, and all birthed speckled except one, and he took all their offspring that year. This is an isnad good with trustworthy men, and Allah knows best. It has been mentioned from the transmission of the people of the book about Jacob, peace be upon him, when he separated from his uncle Laban, that he was granted what was born modeled from his sheep, and he acted similarly to what was mentioned about Moses, peace be upon him, Allah knows best."

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