He heard directly from Abu al-Waqt al-Sijzī when he was only four years old; from Shahardār ibn Shīrawayh al-Daylamī; from the ḥadith master Abu Zur‘a ibn Ṭāhir al-Maqdisī; from Abu al-ʿAlāʾ al-ʿAṭṭār; Muʿammar ibn al-Fākhir; Abu al-Ḥusayn ʿAbd al-Ḥaqq al-Yūsufī; ʿAbd Allāh ibn al-Ṣamad al-ʿAṭṭār; the scribe Shahdah; Abu al-Faḍl ʿAbd Allāh ibn Aḥmad, preacher of Mosul; Abu Ṭālib Muḥammad ibn ʿAlī al-Kattānī al-Wāsiṭī; Muḥammad ibn Ṭalḥah al-Baṣrī al-Mālikī there; Abu al-ʿAbbās Aḥmad ibn Yanal al-Turk; Abu al-Fatḥ ʿAbd Allāh ibn Aḥmad al-Khiraqī; Abu Mūsā Muḥammad ibn Abī ʿĪsā al-Madīnī – and others of their generation in Iraq, Isfahan, the Jazīrah, Syria, and the Ḥijāz.

He collected and composed works, excelled in hadith – especially in genealogy – and made Baghdad his permanent home.

Abu ʿAbd Allāh al-Dubaithī (1) said: “In Baghdad he studied jurisprudence according to the Shāfiʿī school, kept company with the scholars, distinguished himself and grasped matters thoroughly, and became one of the people most gifted in memorising hadith, its chains of transmission, and its narrators. Together with this he was ascetic, devout, disciplined, and constant in remembrance. He authored several works on hadith, dictated numerous sessions, had an immense store of memorised material, and was delightful in discussion. Knowledge of the hadiths dealing with legal rulings predominated in him. He dictated the various chains for the traditions found in the Muḥadhdhab of Shaykh Abu Isḥāq, giving complete isnāds, but did not complete the project.”

Abu ʿAbd Allāh ibn al-Najjār said in his History (2): “Al-Ḥāzimī was one of the imams who were ḥuffāẓ, well-versed in the fiqh of hadith, its meanings, and its transmitters. He authored the book al-Nāsikh wa’l-Mansūkh (Abrogating and Abrogated Reports); the book ʿAjālat al-Mubtadiʾ fī al-Nasab (A Swift Aid to the Beginner on Genealogy); and the book al-Muʾtalif…"