Despite the trend towards hadiths, the questioning of their authority continued during the Abbasid dynasty and existed during the time of Al-Shafi'i, when a group known as "Ahl al-Kalam" argued that the prophetic example of Muhammad "is found in following the Quran alone", rather than Hadith.[75][76] The majority of Hadith, according to them, was mere guesswork, conjecture, and bidah, while the book of God was complete and perfect, and did not require the Hadith to supplement or complement it.[77]