al-Junayd al-Baghdadi

Abu al-Qasim al-Junayd ibn Muhammad al-Baghdadi (died 298 AH / 910 CE) was the most important Sufi master of the classical period, universally acknowledged within the Sufi tradition as the "Master of the Group" (Sayyid al-Ta'ifa) whose synthesis of Islamic jurisprudence with spiritual discipline established the mainstream parameters of orthodox Islamic mysticism. He was of Persian origin, born and raised in Baghdad, the son of a glass merchant and nephew of Sari al-Saqati under whom he studied.

He also studied fiqh under Abu Thawr and hadith with Sufyan ibn Uyayna. His training in Islamic law alongside his spiritual formation under Sari al-Saqati gave him the combination of legal precision and experiential depth that defined his approach: he insisted that the mystical path must be firmly grounded in Quran, Sunnah, and the law. He reportedly said: "Our knowledge is bounded by the Book and the Sunnah. Whoever has not memorized the Quran and written hadith has no standing among us."

His letters and sayings — many preserved by his students — developed key concepts in Islamic spirituality including the doctrine of fana (annihilation of the ego in Allah) interpreted in a way that maintained the servant's distinction from the divine. He opposed the interpretations of al-Hallaj and others who seemed to blur that distinction, maintaining the strict theological boundaries of Sunni Aqeedah while simultaneously articulating experiences of profound intimacy with Allah.

He is positioned in nearly every Sufi silsila (chain of transmission) as the central figure through whom the spiritual authority of the early Sufi masters reaches the classical orders. He died in Baghdad in 298 AH, having spent a life integrating the outer and inner sciences of Islam at their highest levels.