Hadith remembers God unceasingly. (Al-Ahzab 33: 21) The hadith literature is based on spoken reports in circulation after the death of Muhammad. Unlike the Qur'an, ahadith were not promptly written down during Muhammad's life or immediately after his death. Hadith were evaluated and gathered into large collections during the 8th and 9th centuries, generations after the death of Muhammad, after the end of the era of the "rightful" Rashidun Caliphate, over from where Muhammad lived. "Many thousands of times" more numerous than Quranic verse, ahadith have been described as resembling layers surrounding the “core” of the Islamic belief (the Quran). Well-known,
Ahl al-Hadith on to the early Sunni creed. This theological school, which is also known as traditionalist theology, has been championed in recent times by the Salafi movement. The term "ahl al-hadith" is sometimes used in a more general sense to denote a particularly enthusiastic commitment to hadith and to the views and way of life of the Salaf (exemplary early Muslims). The Ahl al-Hadith movement emerged toward the end of the eighth century CE among scholars of hadith who held the Quran and authentic hadith to be the only acceptable sources of law and creed. At first these scholars formed minorities