stylistic:style_transfer, information:extraction, quality:corruption, linguistic:translation
Hadith

Other important sources include the hadith collections, accounts of verbal and physical teachings and traditions attributed to Muhammad. Hadiths were compiled several generations after his death by Muslims including Muhammad al-Bukhari, Muslim ibn al-Hajjaj, Muhammad ibn Isa at-Tirmidhi, Abd ar-Rahman al-Nasai, Abu Dawood, Ibn Majah, Malik ibn Anas, al-Daraqutni.

Muslim scholars have typically placed a greater emphasis on the hadith literature instead of the biographical literature, since hadiths maintain a traditional chain of transmission (isnad); the lack of such a chain for the biographical literature makes it unverifiable in their eyes. The hadiths generally present an idealized view of Muhammad. Western scholars have expressed skepticism regarding the verifiability of these chains of transmission. It is widely believed by Western scholars that there was widespread fabrication of hadith during the early centuries of Islam to support certain theological and legal positions, and it has been suggested that it is "very likely that a considerable number of hadiths that can be found in the hadith collections did not actually originate with the Prophet". In addition, the meaning of a hadith may have drifted from its original telling to when it was finally written down, even if the chain of transmission is authentic. Overall, some Western academics have cautiously viewed the hadith collections as accurate historical sources, while the "dominant paradigm" in Western scholarship is to consider their reliability suspect. Scholars such as Wilferd Madelung do not reject the hadith which have been compiled in later periods, but judge them in their historical context.