Aḥmad ibn Manṣūr ibn Muslim ibn Yazīd al-Naysābūrī, al-Ḥīrī, the maternal grandson of the Imām Aḥmad ibn ʿAmr al-Ḥarashī.
He studied under Muḥammad ibn Rāfiʿ, Isḥāq ibn Manṣūr, ʿAbd Allāh ibn Hāshim, ʿĪsā ibn Aḥmad al-ʿAsqalānī, and Baḥr ibn Naṣr al-Khawlānī—whom he met in Mecca—as well as Aḥmad ibn Manṣūr al-Ramādī, Abū Zurʿah al-Rāzī, Ibn Wārah, and many others.
Among those who transmitted from him were his own teacher Aḥmad ibn al-Mubārak al-Mustamlī, Daʿlaj al-Sijzī, Abū ʿAlī al-Naysābūrī, Abū Bakr al-Ismāʿīlī, Abū al-Ḥusayn Aḥmad ibn Muḥammad al-Khaffāf, Muḥammad ibn Aḥmad ibn ʿAbdūs, and others besides them.
He was a highly respected, dignified scholar of notable standing.
He passed away in Dhū al-Qaʿdah, 317 AH, at more than ninety years of age.
The judge Abū Bakr Aḥmad ibn al-Ḥasan al-Ḥīrī—the teacher of al-Bayhaqī—is his grandson.
277 – al-Ṭūsī, Abū al-Ḥasan Muḥammad ibn Aḥmad ibn Zuhayr*
The imām, ḥadīth master, scholar, and author Abū al-Ḥasan Muḥammad ibn Aḥmad ibn Zuhayr ibn Tahmān al-Qaysī, known as al-Ṭūsī.
He received knowledge from ʿAbd Allāh ibn Hāshim al-Ṭūsī, Isḥāq ibn Manṣūr al-Kawsaj, ʿAbd al-Raḥmān ibn Bishr, Muḥammad ibn Yaḥyā al-Dhuhlī, and their peers.