মুসনাদে আহমাদ - Musnad Ahmad

According to Makataba Shamila, it is the largest hadith book written in the history of Islam with more than 27,000 hadiths. Here it is organized by the hadith narrated by each of the Companions instead of the thematic hadith narration, and it begins with the hadith of 'Asarah Mubasharah ("Ten people who were promised Paradise"). This is done in recognition of their dignity and their efforts to obtain hadith from the Messenger of God.

Some say that Ibn Hamble made a comment about his book which reads as follows: "I have included in this book only those hadiths which are used by other scholars as evidence." As some Hanbali scholars Abul-Faraj ibn al-Jawzi claim, there are some hadiths in the Musnad where a narrator has made some additional additions. Some say that there are nine such hadiths, or others say that there are fifteen hadiths. However, everyone agrees that the hadiths which are suspected to be fabricated are not new hadiths.