He studied under Ibrāhīm ibn Bashshār al-Khurasānī and Muḥammad ibn Manṣūr al-Ṭūsī.
Among those who related ḥadith from him were ʿAlī ibn Muḥammad al-Wāʿiẓ al-Miṣrī, Abū Muḥammad al-Jarīrī, ʿAlī ibn Ḥafṣ al-Rāzī, Muḥammad ibn ʿAlī al-Kattānī, and others.
He also consorted with Sarī al-Saqaṭī and Dhū al-Nūn al-Miṣrī.
It is said that he was the first to discourse on the science of fanāʾ and baqāʾ (annihilation and subsistence). Yet any brief utterance that slipped from him—though he intended only good—gave rise to a weighty matter, to which every misguided ittiḥādī (monist) then clung. (1)
Abū al-Qāsim ʿUthmān ibn Mardān al-Nuhāwandī said: “I first met Abū Saʿīd al-Kharrāz in the year 272 AH and accompanied him for fourteen years. He died in 286 AH.”
Others, however, maintained that he passed away in 277 AH.
Al-Sulamī said: “He is the leading authority of the fraternity in every branch of their knowledge. During the early part of his path he displayed marvels and miracles. He is the most eloquent of them in speech, save al-Junayd, for he is the Imam.”
Al-Qushayrī (2) added that he associated with Dhū al-Nūn, Sarī, al-Nibājī, and Bishr al-Ḥāfī.
Among his sayings is: “Every inward state that the outward contradicts is false.” (3)