Methodology and Structure

Hilyat al-Awliya' wa Tabaqat al-Asfiya' — "Adornment of the Friends of God and Classes of the Pure" — is organized chronologically by generation (tabaqah), beginning with the Companions of the Prophet and proceeding through the Successors (Tabi'un), the Successors of the Successors, and subsequent generations down to Abu Nu'aym's own era. This generational structure emphasizes the continuity of the tradition of piety from the prophetic era through the centuries.

For each individual, Abu Nu'aym provides biographical information and then, most distinctively, quotations of their sayings, accounts of their devotional practices, descriptions of their character, and stories illustrating their spiritual states. These accounts are transmitted with isnads (chains of narration), applying the same documentary standards to spiritual biography that hadith scholars applied to prophetic traditions. This methodological choice was central to Abu Nu'aym's project: by presenting the accounts of the awliya' (friends of God) with proper hadith-style documentation, he integrated them into the mainstream of Islamic transmitted knowledge.

The range of individuals included is broad. Abu Nu'aym includes among the awliya' not only figures who would later be classified as Sufi masters — Hasan al-Basri, Rabi'ah al-Adawiyyah, Ibrahim ibn Adham, Bishr al-Hafi, al-Junayd, and others — but also major hadith scholars, ascetics of various types, early jurists, and other figures distinguished for their piety rather than mystical teaching per se. This breadth reflects his conception of the "friends of God" as encompassing all those who lived their religion with exemplary depth.

The saying collections — apophthegmata, wisdom sayings attributed to each figure — are among the most valuable parts of the work. Many of these sayings are not preserved elsewhere in such complete form, and the Hilyat al-Awliya' is the primary source for important statements attributed to early Sufi and ascetic figures. These collections influenced subsequent Sufi literature enormously, being quoted in later texts like al-Qushayri's Risalah and al-Ghazali's Ihya' Ulum ad-Din.

The scale of the work is remarkable — the standard modern edition fills ten substantial volumes. This size reflects both the breadth of Abu Nu'aym's inclusion criteria and his thoroughness in documenting each individual with multiple accounts.