Ĥāfiž as-Suyūţī writes in his Ţabaqāt al-Ĥuffāž, p.404

“Al-Khaţţābi al-Imām al-Állāmah al-Mufīd al-Muĥaddith ar-Raĥĥāl Abū Sulaymān Ĥamd ibn Muĥammad ibn Ibrāhīm ibn al-Khaţţāb al-Bustī. [The Imām, the scholar of immense benefit, the Muĥaddith, the Traveler, Abū Sulayman..]

He is the author of many works. He narrates from Abū Saýīd ibn al-Aárābī, Abū Bakr ibn Dāsah and al-Aşam. Ĥākim narrates from him.  He has authored “Sharĥ Bukhārī”, “Máālim as-Sunan”, “Gharīb al-Ĥadīth”, Sharĥ Asmā al-Ĥusnā”, “Al-Úzlah” among others.

He is a trustworthy [narrator], and an authority in many sciences. He took his language sciences from Abū Úmar az-Zāhid, fiqh from Al-Qaffāl and ibn Abū Hurayrah. He is also mistakenly known as Aĥmed.  His verse is brilliant. He passed away in Bust in Rabiý al-Ākhir of the year 388AH.

————————————————————
Imām Yāfiýi writes in Mir’āt al-Jinān, vol.2/p.435-436
“The great knowledgeable, famous imām Abū Sulaymān al-Khaţţābi Ĥamad ibn Muĥammad ibn Ibrāhīm ibn al-Khaţţāb al-Bustī ash-Shafiýī passed away in 388AH. [al-imām al-kabīr al-khabīr ash-shahīr].  He was a great jurist, literatteur, traditionalist [faqīh, adīb, muĥaddith]. He has excellent works to his credit among which are:

1. Iýlām as-Sunan,
2. Sharĥ al-Bukhārī
3. Máālim as-Sunan,
4. Sharĥ Abū Dawūd
5. Gharīb al-Ĥadīth
6. Işlāĥ Ghalaţ al-Muĥaddithīn
7. Kitāb Bayān ad-Duáā, etc.

He was a student of Abū Álī aş-Şaffār and Abū Jaáfar ar-Razzāz in Baghdād. Ĥākim Abū Ábdallāh an-Nīsābūri, Ábd al-Ghaffār ibn Muĥammad al-Farisī, Abū al-Qāsim Ábd al-Wahhāb and Abū Sahl al-Khaţţābi have all narrated from Al-Bustī.  It is said that he resembled Abū Úbayd al-Qāsim ibn Salām in his time as regards to knowledge and scholarship, literary prowess, austerity, scrupulousness, teaching and writing [ílman wa adaban wa zuhdan wa war’án wa tadrīsan wa tālīfan]

Ĥākim says: I asked Abū al-Qāsim, Mužaffar ibn Ţāhir whether his (Al-Bustī) name was Ĥamd or Aĥmed. He replied: I have heard him say: ‘My name is Ĥamd, but people erroneously write Aĥmed, and i have left them at it.’