Ibn as-Salah

Uthman ibn Abdurrahman ibn as-Salah ash-Shahrazuri (577-643 AH / 1181-1245 CE) was a Shafii hadith scholar who authored the most influential manual on hadith methodology in Islamic history. Born in Shahrazur (in present-day Iraqi Kurdistan), he studied in Mosul, Baghdad, and the Levant under leading scholars of hadith and jurisprudence. He eventually settled in Damascus, where he directed the Dar al-Hadith al-Ashrafiyyah, the premier hadith teaching institution of the Muslim world.

Ibn as-Salah's magnum opus is Muqaddimat Ibn as-Salah (commonly known as Ulum al-Hadith or the Muqaddimah), a systematic manual on hadith terminology and methodology that synthesized the scattered writings of earlier scholars into a single, organized reference. The work defines and explains the various categories of hadith (sahih, hasan, daif, and their subcategories), the rules for accepting and rejecting narrators, the conditions for valid transmission, and dozens of other technical issues. It became the foundational text for all subsequent works on hadith sciences, with virtually every later author writing a commentary, abridgment, or versification of it.

Among the most famous works based on Ibn as-Salah's Muqaddimah are an-Nawawi's Taqrib, Ibn Kathir's al-Baith al-Hathith, Ibn Hajar's Nukhbat al-Fikr, and as-Suyuti's Tadrib ar-Rawi. He died in Damascus in 643 AH (1245 CE). His Muqaddimah remains the most cited and studied work in the science of hadith terminology.