Sources of Islamic Law Quran

arious sources of Islamic law are used by Islamic jurisprudence to elucidate the Sharia, the body of Islamic law. The primary sources, accepted universally by all Muslims, are the Qur'an and Sunnah. The Qur'an is the holy scripture of Islam, believed by Muslims to be the direct and unaltered word of Allah. The Sunnah consists of the religious actions and quotations of the Islamic Prophet Muhammad and narrated through his Companions and Shia Imams. However, some schools of jurisprudence use different methods to judge the source's level of authenticity.

As Islamic regulations stated in the primary sources do not explicitly deal with every conceivable eventuality, jurisprudence must refer to resources and authentic documents to find the correct course of action. According to Sunni schools of law, secondary sources of Islamic law are consensus among Muslims jurists, analogical deduction, al-Ra'y; independent reasoning, benefit for the Community and Custom. Hanafi school frequently relies on analogical deduction and independent reasoning, and Maliki and Hanbali generally use the Hadith instead. Shafi'i school uses Sunnah more than Hanafi and analogy more than two others. Among Shia, Usuli school of Ja'fari jurisprudence uses four sources, which are Qur'an, Sunnah, consensus and aql. They use ijma under special conditions and rely on aql (intellect) to find general principles based on the Qur'an and Sunnah, and use usul al-fiqh as methodology to interpret the Qur'an and Sunnah in different circumstances, and Akhbari Jafaris rely more on Hadith and reject ijtihad. According to Momen, despite considerable differences in the principles of jurisprudence between Shia and the four Sunni schools of law, there are fewer differences in the practical application of jurisprudence to ritual observances and social transactions

Primary sources
The Qur'an is the first and most important source of Islamic law. Believed to be the direct word of God as revealed to Muhammad through angel Gabriel in Mecca and Medina, the scripture specifies the moral, philosophical, social, political and economic basis on which a society should be constructed. The verses revealed in Mecca deal with philosophical and theological issues, whereas those revealed in Medina are concerned with socio-economic laws. The Qur'an was written and preserved during the life of Muhammad, and compiled soon after his death.

Muslim jurists agree that the Qur'an in its entirety is not a legal code (used in the modern sense); rather its purpose is to lay down a way of life which regulates man's relationship with others and God. The verses of the Qur'an are categorized into three fields: "science of speculative theology", "ethical principles" and "rules of human conduct". The third category is directly concerned with Islamic legal matters which contains about five hundred verses or one thirteenth of it. The task of interpreting the Qur'an has led to various opinions and judgments. The interpretations of the verses by Muhammad's companions for Sunnis and Imams for Shias are considered the most authentic, since they knew why, where and on what occasion each verse was revealed.

Mahmood, M.(2011).The principles of muhammadan  law:Al-Qanoon Publishers.