While many early scholars wrote books titled Kitab al-Zuhd (including Ibn al-Mubarak and Waki' ibn al-Jarrah), Imam Ahmad’s compilation is unique in its breath and structure. Structure and Contents
Imam Ahmad compiled narrations ( Athar ) from various early sources. Some chains of narration are authentic ( Sahih ), while others are weak ( Da'if ). Modern printed editions often include footnotes by scholars like Shaykh Al-Albani or Zainuddin Al-Iraqi grading the narrations. kitab az zuhd imam ahmad pdf link