Hadith of the Quran and Sunnah Hadith of the Quran and Sunnah Several hadith (oral tradition about the words and deeds of the Islamic prophet Muhammad) indicate the importance as sources of Islam not only the Quran (the revelation of God to Muhammad, infallible but containing compressed information), but also of the Sunnah of the Islamic prophet Muhammad (a detailed explanation of the everyday application of the principles established in the Qur'an that is based on ahadith). One of these hadith quotes Muhammad as saying: "I have left among you two matters by holding fast to which, you shall never be misguided: the Book of God
Criticism of Hadith According to Racha El Omari, early Mutazilites believed that hadith were susceptible to "abuse as a polemical ideological tool"; that the "matn" (content) of the hadith -- not just the "isnad" -- ought to be scrutinized for doctrine and clarity; that hadith "supported by some form of "tawātur"", i.e. by a large number of "isnād" strands, each beginning with a different Companion, were valid. In writing about "mutawatir" (transmitted via numerous chains of narrators) and "ahad" (any ahadith that is not "mutawatir") and its importance from the legal theoretician's point of view, Wael Hallaq notes the medieval scholar Al-Nawawi argued