Sharia
Branches and details (furūʿ al-fiqh)

The domain of furūʿ al-fiqh (lit. branches of fiqh) is traditionally divided into ʿibādāt (rituals or acts of worship) and muʿāmalāt (social relations). Many jurists further divided the body of substantive jurisprudence into "the four quarters", called rituals, sales, marriage and injuries. Each of these terms figuratively stood for a variety of subjects. For example, the quarter of sales would encompass partnerships, guaranty, gifts, and bequests, among other topics. Juristic works were arranged as a sequence of such smaller topics, each called a "book" (kitab). The special significance of ritual was marked by always placing its discussion at the start of the work.

Some historians distinguish a field of Islamic criminal law, which combines several traditional categories. Several crimes with scripturally prescribed punishments are known as hudud. Jurists developed various restrictions which in many cases made them virtually impossible to apply. Other crimes involving intentional bodily harm are judged according to a version of lex talionis that prescribes a punishment analogous to the crime (qisas), but the victims or their heirs may accept a monetary compensation (diya) or pardon the perpetrator instead; only diya is imposed for non-intentional harm. Other criminal cases belong to the category of taʿzīr, where the goal of punishment is correction or rehabilitation of the culprit and its form is largely left to the judge's discretion. In practice, since early on in Islamic history, criminal cases were usually handled by ruler-administered courts or local police using procedures which were only loosely related to Sharia.

The two major genres of furūʿ literature are the mukhtasar (concise summary of law) and the mabsut (extensive commentary). Mukhtasars were short specialized treatises or general overviews that could be used in a classroom or consulted by judges. A mabsut, which usually provided a commentary on a mukhtasar and could stretch to dozens of large volumes, recorded alternative rulings with their justifications, often accompanied by a proliferation of cases and conceptual distinctions. The terminology of juristic literature was conservative and tended to preserve notions which had lost their practical relevance. At the same time, the cycle of abridgement and commentary allowed jurists of each generation to articulate a modified body of law to meet changing social conditions. Other juristic genres include the qawāʿid (succinct formulas meant to aid the student remember general principles) and collections of fatwas by a particular scholar.

Classical jurisprudence has been described as "one of the major intellectual achievements of Islam" and its importance in Islam has been compared to that of theology in Christianity.
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