Islam is complete code of life. Islam is ‘Deen’ which mean complete in all respects. Islamic law system is comprehensive and complete system which provides guidance in every aspect of the life. The fundamental sources of Islamic law or Sharia law are the Holy Quran and Sunnah of Prophet Muhammad (PBHH). All Muslim sects whether Sunni or Shia agree upon these two sources.
The Quran is the first and primary source of Islamic law. Quran is book of God or Allah and even after 1400 years it is in its original form and not a single word is changed. Quran provides basic laws which are the fundamentals of Islamic Sharia. It is without any doubt the most basic, uncontroversial and fundamental source of Islamic Sharia or Islamic Laws.
The second primary source of Islamic laws is the Sunnah of Prophet Muhammad (PBUH). Sunnah means all the actions and saying of Holy Prophet. Sunnah is also known as Hadis or Precept.
Ijma is third source of Islamic Law. Basically Ijma means consensus of people on particular issue when there is no guidance available from Holy Quran and Sunnah.
Ijtehad is the fourth source of Islamic Law. When something is not clear from the Holy Quran or Sunnah then deduction can be used. It is the process of deduction which is not to change the law of the text.
Qiyas is also the source of Islamic law. We can compare it with legal fiction in western Jurisprudence. It is based on Quran, Sunnah and Ijma.
These above mentioned source are main source of Islamic law other source includes;