Hadith

Hadith. In Islam, the term refers to the recorded sayings, actions, and tacit approvals attributed to the Prophet Muhammad. Alongside the Quran, it forms the primary scriptural foundation for Islamic law, theology, and spiritual practice. The meticulous study and authentication of these reports constitute a major Islamic science, essential for understanding the Sunnah and guiding the life of the Muslim community.

Definition and significance

A single report typically consists of two parts: the *matn* (textual content) and the *isnad* (chain of transmitters tracing back to the Prophet). The significance within Islam cannot be overstated, as it provides the essential context for the implementation of the Quran's teachings. It elucidates details of ritual worship, such as prayer and almsgiving, and offers guidance on legal, ethical, and social matters. For scholars like Al-Shafi‘i, the authority was established as a primary source of legislation second only to the Quran, shaping the development of the major schools of jurisprudence.

Collection and compilation

The process began informally during the lifetime of Muhammad, with companions like Ibn Abbas and Aisha narrating his actions. Formal compilation efforts gained momentum in the 8th and 9th centuries CE, driven by concerns over fabrication and the desire to preserve the Sunnah. Early scholarly compilers, including Imam Malik in Medina with his *Al-Muwatta*, began organizing reports by legal topic. This era saw the monumental work of figures such as Al-Bukhari and Muslim ibn al-Hajjaj, who traveled extensively across the Caliphate, from Baghdad to Bukhara, to verify and collect narrations.

Classification and authentication

Scholars developed a rigorous science, known as *ʿIlm al-rijāl* (the science of men), to evaluate each report. The primary classification is based on the reliability and continuity of the *isnad*, resulting in categories like *ṣaḥīḥ* (authentic), *ḥasan* (good), and *ḍaʿīf* (weak). A report could also be rejected as *mawḍūʿ* (fabricated). Key criteria included the moral integrity and precision of each transmitter in the chain, such as Ibn Masud or Abu Hurairah, and the geographical and historical plausibility of the transmission line. This meticulous process was systematized by authorities like Ibn Hanbal and Al-Nasāʾī.

Major collections

The most revered compilations are the *Six Books*, which are canonical in Sunni Islam. The two most esteemed are *Ṣaḥīḥ al-Bukhārī* and *Ṣaḥīḥ Muslim*, often referred to collectively as *Al-Ṣaḥīḥayn*. The other four are the *Sunan Abī Dāwūd*, *Jāmiʿ al-Tirmidhī*, *Sunan al-Nasāʾī*, and *Sunan Ibn Mājah*. In Shia Islam, primary sources include *Al-Kāfī* by Al-Kulaynī and compilations by Ibn Bābawayh and Al-Ṭūsī, which emphasize narrations from the Ahl al-Bayt and Imams like Ali and Jaʿfar al-Ṣādiq.

Role in Islamic law and theology

Alongside the Quran, it is a fundamental source of *uṣūl al-fiqh* (principles of jurisprudence). Jurists from the Hanafi, Maliki, Shafi‘i, and Hanbali schools used authenticated reports to derive rulings on everything from commercial law to criminal penalties. In theology, reports were pivotal in debates on issues like predestination and the attributes of Allah, with groups such as the Mu'tazila and Ash'ari scholars citing different narrations. The corpus also deeply influenced Sufism, providing the basis for spiritual practices and the conduct of figures like Al-Ghazali.

Criticism and scholarly debate

The field has faced internal and external criticism. Historically, some Muslim scholars, including the *Ahl al-Kalām*, debated the epistemological certainty of reports, with figures like Ibn Qutaybah defending their authority. Modern critiques, from both within the Muslim world and from Western orientalists like Ignác Goldziher and Joseph Schacht, have questioned the historical reliability of early *isnads* and the potential for political fabrication during the Umayyad and Abbasid eras. Contemporary scholars, such as those associated with the *Qurʾāniyyūn* movement, reject its authority entirely, while others advocate for renewed methodological critique within the tradition.