Since the advent of Islam and the revelation of the Qur'an in the early years of the seventh century AD, the Muslim Holy Book has been the subject of many extensive analytical studies. The focus of the great majority of these studies has been the theological and legislative aspects of the Holy Book, for the Qur'an provides Muslims with detailed guidance on their everyday problems. Together with the sayings, actions, and recommendations of Muhammad, the Qur'an has been the ultimate source of legal authority for Muslims over the past fourteen centuries.
Muslim scholars have also painstakingly examined, analyzed and interpreted the various verses of the Holy Book, detailing the requirements the Qur'an imposes on Muslims in order for them to achieve spiritual purity. Thus, in addition to its legislative and theological value, the Qur'an has also served as a source of spiritual guidance for the followers of Islam.