|Author||Ahmad ibn Hanbal|
It is one of the largest hadith book written in Islamic History containing more than twenty seven thousand (27000) hadiths according to Maktaba Shamila. It is organized into compilations of the hadiths narrated by each Companion (Sahabi), starting with the 'asharah mubashsharah ("the ten who were promised Paradise"). This highlights their status and the efforts they made to preserve the ahadeeth of the Messenger of Allah.
It is said by some that Ahmad ibn Hanbal made a comment in regard to his book which reads as follows: "I have only included a hadith in this book if it had been used as evidence by some of the scholars." Abu al-Faraj Ibn al-Jawzi ironically claimed that the Musnad contains hadiths that are fabricated by interpolation (i.e. the narrator jumbling up information, mixing texts and authoritative chains), which were said to be nine Hadiths by some, or fifteen hadiths by others. However, it is agreed that the hadith that are suspected to be fabricated are not new hadiths that are creations of a dubious narrator's imagination. Muslim scholars regard it as an authentic book of Hadith.
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Abu Juhaym reported: The Prophet, peace and blessings be upon him, said, "The Quran is recited in seven ways. Do not argue over the Quran, for arguing over the Quran is an act of unbelief."
Source: Musnad A?mad 17199 Grade: Sahih (authentic) according to Al-Suyuti
The book has been published by many organizations around the world, including:
The Internet Archive hosts a copy of Musnad Ahmad Volume 4 in English at https://archive.org/details/musnadahmadvol.4final.