al-Ḥusayn ibn ʿAbd Allah al-Baghdādī al-Ājurrī, the author of many writings, among them: the large Kitāb al-Sharīʿah fī al-Sunnah, Kitāb al-Ruʾyah (The Vision), Kitāb al-Ghurabāʾ (The Strangers), Kitāb al-Arbaʿīn (The Forty), Kitāb al-Thamānīn (The Eighty), Kitāb Ādāb al-ʿUlamāʾ (Etiquette of Scholars), Kitāb Masʾalat al-Ṭāʾifīn (The Question of Those Circumambulating), Kitāb al-Tahajjud (Night-Vigil Prayer), and other works (1).
He received hadith from Abū Muslim al-Kajjī—his foremost shaykh—Muḥammad ibn Yaḥyā al-Marwazī, Abū Shuʿayb al-Ḥarrānī, Aḥmad ibn Yaḥyā al-Ḥulwānī, al-Ḥasan ibn ʿAlī ibn ʿUlwiyyah al-Qaṭṭān, Jaʿfar ibn Muḥammad al-Firyābī, Mūsā ibn Hārūn, Khalf ibn ʿAmr al-ʿUkbarī, ʿAbd Allah ibn Nājjiyah, Muḥammad ibn Ṣāliḥ al-ʿUkbarī, Jaʿfar ibn Aḥmad ibn ʿĀṣim al-Dimashqī, ʿAbd Allah ibn al-ʿAbbās al-Ṭayālisī, Ḥāmid ibn Shuʿayb al-Balkhī, Aḥmad ibn Sahl al-Ushnānī the Qurʾān-reciter, Aḥmad ibn Mūsā ibn Zanjawayh al-Qaṭṭān, ʿĪsā ibn Sulaymān, the scribe of Dāwūd ibn Rushayd, Abū ʿAlī al-Ḥasan ibn al-Ḥabāb the reciter, Abū al-Qāsim al-Baghawī, Ibn Abī Dāwūd, and many others besides.
He was truthful, pious, devoted in worship, and firmly committed to the Sunnah and its practice.