and al-Thawrī, Zāʾida, Ibn Shawdhab, Shuʿayb ibn Abī Ḥamza, Mālik, and many others.
He was counted among the leading authorities in ḥadīth.
Those who narrated from him include: al-Awzāʿī and al-Thawrī—both of whom were his teachers—, ʿAbd Allāh ibn al-Mubārak, Baqiyya, his cousin Marwān ibn Muʿāwiya al-Fazārī, Abū Usāma, Zakariyyā ibn ʿAdī, ʿĀṣim ibn Yūsuf al-Yarbūʿī, Abū Tawba al-Ḥalabī, ʿAbd Allāh ibn ʿAwn al-Kharrāz, ʿAbd al-Malik ibn Ḥabīb al-Maṣṣīṣī—the teacher of Abū Dāwūd—, Maḥbūb ibn Mūsā al-Farrāʾ, Mūsā ibn Ayyūb al-Naṣībī, Muʿāwiya ibn ʿAmr al-Azdī, ʿAmr al-Nāqid, Muḥammad ibn ʿAbd al-Raḥmān ibn Sahm, Abū Nuʿaym al-Ḥalabī, and a great many others.
Abū Ḥātim said: “Reliable, trustworthy, an imām.”
Al-Nasāʾī said: “Reliable, trustworthy, one of the imāms.”
Al-Khalīlī reported that al-Ḥumaydī said, quoting al-Shāfiʿī: “No one has authored anything on the military expeditions like the book of Abū Isḥāq.”
Abū Ḥātim likewise said: “The scholars unanimously agree that Abū Isḥāq al-Fazārī is an imām to be emulated, without dispute.”
He further related from al-Ḥumaydī: “A man came to Ibn ʿUyayna and said, ‘Abū Isḥāq has narrated from you such-and-such.’ Ibn ʿUyayna replied, ‘Woe to you! If you hear Abū Isḥāq reporting something from me, it will not harm you even if you do not hear it directly from me.’”
Aḥmad al-ʿIjlī said: “He was trustworthy, committed to the sunnah, righteous; he is the one who—”