Hadith root of why there is no single "fiqh" system, but rather a collection of parallel systems within Islam. Much of early Islamic history available today is also based on the hadith, although it has been challenged for its lack of basis in primary source material and the internal contradictions of the secondary material available. Hadith may be "hadith qudsi" (sacred hadith) — which some Muslims regard as the words of God (Arabic: Allah) — or "hadith sharif" (noble hadith), which are Muhammad's own utterances. According to as-Sayyid ash-Sharif al-Jurjani, the hadith qudsi differ from the Quran in that the former
Introduction to the Science of Hadith the earlier scholars as appropriate and mostly sufficed with conclusions drawn from them and then specifying or clarifying a definition. The definitions Ibn al-Ṣalāḥ used to describe the individual terms of hadith terminology were largely in accordance with the views of the majority of hadith specialists. In some instances, he would mention an undisputed opinion, before mentioning one that was widely accepted and then describing the difference. He would generally precede his critique of differing opinions by saying: "I say". For the primary terms described, he mentioned an example to illustrate that definition. His goal in doing so was to