The term Sunnah (Arabic: سنة) literally means "way," "habit," or "custom." In Islamic usage it refers to the words, actions and tacit approvals of the Prophet Muhammad as preserved by his companions and later transmitters. The Sunnah functions as a model for personal conduct, ritual practice and community norms, and is routinely cited alongside the Qur'an when Muslims discuss correct belief and behavior.

Sources and relationship to Hadith

Material considered part of the Sunnah is known primarily through reports called Hadith. A hadith typically records a narration about something the Prophet said, did, or permitted. Scholars distinguish between the abstract concept of the Sunnah (the lived example) and the hadith corpus (the textual records of that example). Not every hadith is accepted as authoritative; scholars have developed methods to evaluate reports by examining chains of transmission and the content of the text.

Role in Islamic law and practice

The Sunnah plays a central role in forming Islamic law (sharia) and ethical guidance. Jurists use the Sunnah to interpret and apply Qur'anic principles, to derive rulings where the scripture is silent or general, and to clarify ritual details. Different legal schools attribute varying weight to particular reports and categories of practice, so the same Sunnah may produce different legal outcomes across communities.

  • Complementary source: clarifies and exemplifies Qur'anic injunctions.
  • Legislative source: supplies rulings and norms used by jurists.
  • Ethical model: shapes manners, charity, and social relations.

Authentication and scholarship

From the early centuries of Islam scholars assessed hadith using two broad elements: the chain of transmission (isnād) and the content (matn). Collections judged especially reliable—such as those compiled in the Islamic tradition by major compilers—became reference points for many communities. The discipline produced categories like "sound" (authentic) and "weak" reports and prompted detailed biographical study of transmitters. While Sunni and Shia traditions share the basic concepts of Sunnah and hadith, they rely on different collections and interpretive priorities.

Scholars also classify sunnahs by practical status: some habits or acts are described as emphasized practice (sunnah mu'akkadah), others as non-emphasized or optional, and some practices are treated as customary without legal force. Debates about the scope and application of the Sunnah continue in contemporary Islamic thought, especially where historical reports interact with modern contexts and values.

Historically, the formal compilation of hadith texts accelerated in the eighth and ninth centuries CE as scholars sought to preserve memory, resolve legal disputes and provide unified models of conduct. Today the Sunnah remains a living reference for ritual rites, moral teaching and community identity across diverse Muslim societies.