Hadith are "expressed in Muhammad's words", whereas the latter are the "direct words of God". A "hadith qudsi" need not be a "sahih" (sound hadith), but may be "da‘if" or even "mawdu‘". An example of a "hadith qudsi" is the hadith of Abu Hurairah who said that Muhammad said: When God decreed the Creation He pledged Himself by writing in His book which is laid down with Him: My mercy prevails over My wrath. In the Shia school of thought, there are two fundamental viewpoints of Hadith: The Akhbari view and the Usuli view. The Usuli scholars stress the importance of
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