Ibn Manjuwayh al-Yazdī (1) —also called al-Iṣfahānī, for he hailed from Isfahan yet lived in Nishapur—was one of the dependable ḥuffāẓ who authored works.
He narrated ḥadith from: Imām Abū Bakr al-Ismāʿīlī, Ibrāhīm b. ʿAbd Allāh al-Naysābūrī, Ismāʿīl b. Nujaid, Abū Bakr b. al-Muqriʾ, Abū Muslim ʿAbd al-Raḥmān b. Shahdal, Abū ʿAbd Allāh b. Manda, and many others.
He journeyed to Bukhara, Samarqand, Herat, and Jurjān, but I have found no report that he ever reached Iraq.
Among those who transmitted from him were: Abū Ismāʿīl ʿAbd Allāh b. Muḥammad al-Anṣārī, ʿAbd al-Raḥmān b. Manda, al-Ḥasan b. Taghlib (2) al-Shīrāzī, Saʿīd al-Baqqāl, ʿAlī b. Aḥmad al-Akhram, Abū Ṣāliḥ the muʾadhdhin, Abū Bakr al-Khaṭīb, Abū Bakr al-Bayhaqī, and a host of others.
Abū Ismāʿīl al-Anṣārī said: “Abū Bakr Aḥmad b. ʿAlī al-Iṣfahānī narrated to us; he is the most retentive memorizer of all the people I have ever seen.” (3)
He also said: “During both my travels and my residence I encountered one ḥāfiẓ and half a ḥāfiẓ;”