Islamic Law and its Sources

Sharia is the moral code and religious law of Islam. Sharia deals with many topics addressed by secular law, including crime, politics, and economics, as well as personal matters such as sexual intercourse, hygiene, diet, prayer, and fasting. Though interpretations of sharia vary between cultures, in its strictest definition it is considered the infallible law of God—as opposed to the human interpretation of the laws (fiqh).
There are two primary sources of sharia law: the precepts set forth in the Quran, and the example set by the Islamic prophet Muhammad in the Sunnah. Where it has official status, sharia is interpreted by Islamic judges (qadis) with varying responsibilities for the religious leaders (imams). For questions not directly addressed in the primary sources, the application of sharia is extended through consensus of the religious scholars (ulama) thought to embody the consensus of the Muslim Community (ijma). Islamic jurisprudence will also sometimes incorporate analogies from the Quran and Sunnah through qiyas, though Shia jurists prefer reasoning ('aql) to analogy.
The reintroduction of sharia is a longstanding goal for Islamist movements in Muslim countries, but attempts to impose sharia have been accompanied by controversy, violence, and even warfare such as the Second Sudanese Civil War. Some in Israel and other countries in Asia have maintained institutional recognition of sharia, and use it to adjudicate their personal and community affairs. In western countries where Islamic immigration is more recent, Muslim minorities have introduced sharia family law for use in their own disputes, such as Britain'sMuslim Arbitration Tribunal.

The sources of Islamic Law

The Quran
Muslims believe the Quran to be the direct words of Allah, as revealed to and transmitted by the Prophet Muhammad. All sources of Islamic law must be in essential agreement with the Quran, the most fundamental source of Islamic knowledge. When the Quran itself does not speak directly or in detail about a certain subject, Muslims only then turn to alternative sources of Islamic law.
The Sunnah
Sunnah is the traditions or known practices of the Prophet Muhammad, many of which have been recorded in the volumes of Hadith literature. The resources include many things that he said, did, or agreed to -- and he lived his life according to the Quran, putting the Quran into practice in his own life. During his lifetime, the Prophet's family and companions observed him and shared with others exactly what they had seen in his words and behaviors -- i.e. how he performed ablutions, how he prayed, and how he performed many other acts of worship. People also asked the Prophet directly for rulings on various matters, and he would pronounce his judgment. All of these details were passed on and recorded, to be referred to in future legal rulings. Many issues concerning personal conduct, community and family relations, political matters, etc. were addressed during the time of the Prophet, decided by him, and recorded. The Sunnah can thus clarify details of what is stated generally in the Quran.
Ijma' (consensus)
In situations when Muslims have not been able to find a specific legal ruling in the Quran or Sunnah, the consensus of the community is sought (or at least the consensus of the legal scholars within the community). The Prophet Muhammad once said that his community (i.e. the Muslim community) would never agree on an error.
Qiyas (analogy)
In cases when something needs a legal ruling, but has not been clearly addressed in the other sources, judges may use analogy, reasoning, and legal precedent to decide new case law. This is often the case when a general principle can be applied to new situations.

please write P.B.U.H with the name of Prophet.