Islamic law is the world’s third major legal system, after the common and civil law systems. Although the Quran and Sunna are the original sources of Islamic law, the Islamic legal system has evolved many other sources, methodologies and perspectives. Like any other legal system, the Islamic legal system has developed over many centuries in various Muslim societies, incorporating local cultures and customs as well as some limited state decrees and particularly the work of Muslim jurists. In the words of Joseph Schacht, ‘Islamic law represents an extreme case of “jurists’ law”; it was created and developed by private specialists; legal science, and not the state, plays the part of a legislator, and scholarly handbooks have the force of law’. Islamic law is therefore neither common nor civil law, but is juristic law. Traditionally, Islamic law consists of both revelation and reason. After the death of the Prophet Mohammad (633 AD), the revelation of Islamic law by God to humanity ceased. Humanity now relies on reason to understand Islamic law. According to Allama Muhammad Iqbal (d. 1937), humanity needed the guidance of Prophets when it was primarily controlled by passion and instinct. However, from the time of the Prophet Mohammad, people achieved the ability to reason, and this is why the Prophet Mohammad is the final (khatam) Prophet. Iqbal concludes that the nature of revelation (wahy) is reason. This means that human beings, since the time of the last Prophet, must involve reason and human experiences in developing the legal system of Islam.