aź-Źahabī, may Allāh have mercy upon him, in his Siyar al-A’lām an-Nubalā’ said:

He is the Great Imām, the Sheikh of the Shafiites, Abū al-Hasan Ahmad Bin Muhammad Bin Ahmad Bin al-Qāsim Bin Ismā’īl adh-Dhabbī, al-Baghdadī, asy-Syāfi’ī, Ibnu al-Mahāmilī, one of the a’lām (eminent authorities).

He took fiqh from asy-Syeikh Abū Hamid and was the khalifah (substitute/successor) to his halaqahs (teaching circles). He is a marvel in terms of his understanding, intelligence and vastness of knowledge. His father travelled with him and his father thus made him hear from ‘Alī bin ‘Abdurrahman al-Bakkāi and others. He heard from Abū al-Husein Bin Mużaffar and al-Tabaqah. Abū Bakr al-Khatīb became his pupil. His father narrated from Ismā’īl as-Śaffār and his likes. He passed away in 407H.

Asy-Syarīf al-Murtadhā said:

Abu al-Hasan al-Mahamilī visited me with asy-Syeikh Abu Hamid and I did not know him. Abū Hamid said to me: This is Abu Hasan Bin al-Mahāmilī and he is today more dedicated (having hifż) to fiqh than me.

Abū Ishāq asy-Syairāzī said:

He took fiqh from Abū Hāmid. He has a ta’leeqah (book supplement) [1] attributed to Abū Hāmid, which is transmitted through him. He has many works detailing both khilāf (differences of opinion) and the maźhab.

I say:

He authored the book ” al-Majmū’ ” which is in several volumes, ” al-Muqni’ ” in one volume, al-Lubāb [2] and others. He passed away at a young age in Rabi’ al-Ākhir in the year 415 AH at the age of 47.

May Allāh have mercy on him.

[1] This is the Ta’līqah al-Kubra which delves into the furū’ attributed to Abu Hāmid al-Asfaraini. An-Nawāwī said:

Note that the pivot (madār) of the books of our ‘iraqī aśhab or the jamahīr (large majority) of them, together with the groups of khurasānīs is transmitted through the Ta’līq of Abū Hāmid. It is in about 50 volumes. He gathered in it precious gems which is not shared in the compilations of many masāil (issues) and furū’. He mentioned the maźahib of the ‘ulamā’, and expanded on the dalīls and responses to them. Through it the fiqh of the tarīqah of the ‘Irāqis became widespread.

(Tahźib al-Asmā’ wa al-Lughāt, 2/210)

[2] Abū Zur’ah al-‘Iraqī who passed away in 826 AH made an abridgment of it entitled Tanqīh al-Lubab. Sheikh al-Islām Zakaria al-Anśarī who passed away in 926 AH made an abridgment of this abridgment entitled Tahrīr Tanqīh al-Lubāb. He then made a commentary of this abridgment of his in a book entitled Tuhfah at-Tullāb bi Syarh Tahrīr Tanqīh al-Lubāb. Both of them were published. It is upon this commentary that the Hawasyī (commentary upon commentary) was built upon: Hashiyah ‘Abd al-Birr Bin ‘Abd Allāh al-Ajhurī who passed away in 1070 AH, Hashiyah al-Madābighī who passed away in 1070 AH, Hashiyah al-Qalyūbī, Hashiyah ‘Abd Allāh bin Hijazī asy-Syarqāwī who passed away in 1227 AH, ‘Abd al-Rauf al-Mināwī who passed away in 1031 AH wrote a commentary on the Lubāb itself.

Refer to Kashf azh-Zhunūn w, 1042, 1041, Tārīkh al-Adab al-‘Arabī by Brockleman Arabic Edition 3/304,305 and Tārīkh al-Turath al-Arabī by Sezgin 2/192.