and al-Nasikh wa-l-Mansukh (Abrogating and Abrogated Verses), al-Tarikh (Chronology), the Hadith of Shuʿba, al-Muqaddam wa-l-Muʾakhkhar fi-l-Qurʾan (What Comes First and What Comes Later in the Quran), Jawabat al-Qurʾan (Quranic Responses), the large and the small manuals of al-Manasik (the rites of pilgrimage), and other works besides.
I add: the Book of Iman, the Book of Beverages (1), and I have seen a single folio from his Book of Inheritance Shares.
That Tafsir which has been mentioned is something that simply does not exist. Had it existed, distinguished scholars would have exerted themselves to obtain it and it would have become widely known. Moreover, even if he had composed a Tafsir, it could not have contained more than ten thousand traditions and would necessarily have filled no more than five volumes.
Look at the Tafsir of Ibn Jarir, in which he gathered material exhaustively; yet it does not reach twenty thousand traditions. No one has ever referred to a Tafsir by Ahmad except Abu al-Husayn ibn al-Munadi, who said in his Chronicle: "Lam…"
“[The Musnad] is a major source and a trustworthy reference for scholars of hadith. It was distilled from a vast body of reports and numerous audition sessions, and thus became an authoritative, dependable work to which people turn when disputes arise.
The collection contains more than thirty-thousand hadiths.
Ibn Kathir says in al-Baʿith al-Hathith: ‘In the Musnad of Imam Ahmad there are many isnads and texts that parallel a large number of the hadiths recorded by Muslim—indeed, even by al-Bukhari—yet neither of those two imams included them, nor did any of the authors of the Four Sunan (Abu Dawud, al-Tirmidhi, al-Nasaʾi and Ibn Majah).’
I would add that Imam Ahmad did not intend his Musnad to contain only sound reports. Rather, he included sound (sahih), fair (hasan) and weak (daʿif) narrations, as is clear to anyone who studies its chains of transmission and examines its documentation.
Ibn al-Jawzi states in Sayd al-Khatir: ‘Whoever looks into the book al-ʿIlal compiled by Abu Bakr al-Khallal will find many hadiths—all of them in the Musnad—that Ahmad himself criticised.’
I have copied from the autograph of Qadi Abu Yaʿla Muhammad b. al-Husayn al-Farraʾ, in his discussion of nabidh: ‘Ahmad narrated in his Musnad only what was widely circulated; he did not aim to separate the sound from the unsound. Proof of this is what ʿAbd Allah (b. Ahmad) related: I said to my father, “What do you think of the hadith of Rubaʿi b. Khirash from Hudhayfah?” He asked, “The one transmitted by ʿAbd al-ʿAziz b. Abi Rawwad?” I replied, “Yes.” He said, “Other hadiths contradict it.” I said, “Yet you included it in the Musnad.” He answered, “In the Musnad I sought what was famous. Had I intended to record only what I deemed sound, I would have transmitted from this Musnad only a small portion. My son, you know my method in hadith: I do not omit a weak report if there is nothing in the chapter that contradicts it.”’
The narrator concludes: Ahmad has thus explained his own method in the Musnad; whoever treats it as a criterion of soundness is acting contrary to his intent and purpose.
(1) For his biography, see p. 301, note (1).