Every authentic Hadith is composed of two indispensable parts: the Isnad (الإسناد), which is the unbroken chronological chain of trustworthy narrators going back to the Prophet (ﷺ), and the Matn (المتن), which is the actual substantive text of the statement or action. To guarantee that not a single word was forged, Islamic scholars founded the peerless discipline of 'Ilm al-Rijal (Science of Biographical Evaluation), rigorously investigating each narrator's integrity, memory precision, piety, and historical contemporaneity.

The Six Major Compilations (الكتب الستة) represent the most authoritative primary reference works of Hadith in Islamic scholarship:

• Sahih al-Bukhari (صحيح البخاري) — Compiled by Imam Muhammad al-Bukhari; universally recognized as the most authentic book after the Holy Quran.
• Sahih Muslim (صحيح مسلم) — Compiled by Imam Muslim ibn al-Hajjaj; celebrated for its flawless thematic organization and rigorous narrator verification.
• Sunan Abi Dawud (سنن أبي داود) — Focuses on practical legal jurisprudence (Fiqh) and prophetic legal precedents.
• Jami` at-Tirmidhi (جامع الترمذي) — Renowned for classifying hadith grades (Sahih, Hasan, Da'if) and comparing legal viewpoints.
• Sunan an-Nasa'i (سنن النسائي) — Characterized by exceptionally strict narrator criteria and meticulous textual variations.
• Sunan Ibn Majah (سنن ابن ماجه) — Renowned for concise chapter organization and unique legal rulings.

A Sahih (Sound/Authentic) narration meets five strict conditions: an unbroken chain of narrators, upright moral character (`Adalah) in every narrator, complete and flawless memory retention (Dabt), freedom from hidden doctrinal defects (`Illah), and absence of contradictory isolated statements (Shudhudh). A Hasan (Good) hadith fulfills all the conditions of Sahih except that one or more narrators possessed a slightly lesser degree of retentive precision, yet it remains legally binding and fully authoritative. Fabricated (Mawdu`) narrations are strictly excluded from this application.

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