In this sense, the Islamic heritage can combine what is a sacred religion, and what is history at the same time. As for religion, it is the definitive texts - I mean the Qur’an and the established Sunnah - and these represent the principles, universals, goals and general rules. Nothing but the Qur’an and the established Prophetic hadiths, or possible texts for more than one meaning, all including the Qur’an and the Sunnah, and these represent the branches, details, means and methods of application.