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( Qiyas)
Part of a series on Islam
Usul al-fiqh
(The Roots of Jurisprudence) In Sunni Islamic jurisprudence, the qiyas (Arabic ????) is the process of analogical reasoning in which the teachings of the Hadith are compared and contrasted with those of the Qur'an, i.e., in order to make an analogy with a known injunction (nass) to a new injunction. As a result of this method, the ruling of the Sunnah and the Qur'an may be used as a means to solve or provide a response to a new problem that may arise. This, however, is only the case providing that the set precedent or paradigm and the new problem that has come about will share operative causes (illah)[1]. The illah is the specific set of circumstances that trigger a certain law into action. Both Sunni Islam and Shi'a Islam share Qur'anic interpretation, the Sunnah, and Ijma' (consensus) as sources of Islamic law, although the two sects differ significantly with regards to the manner in which they use these sources. The sects also differ on the fourth source. Sunni Islam uses qiyas as the fourth source, whereas Shi'a Islam uses 'aql (intellect). Other methods of deducing the law, such as mafhm al-nass (the clear implication of the text), tamthil (similarity or likeness), istihsan (juristic preference), or istislah (consideration of public interest), either explicitly rely on qiyas or use methods of analysis that are similar in their understanding of qiyas. For example, qiyas is applied to the injunction against drinking wine to create an injunction against cocaine use. During the Islamic Golden Age, there was a logical debate among Islamic logicians, philosophers and theologians over whether the term qiyas refers to analogical reasoning, inductive reasoning or categorical syllogism. Some Islamic scholars argued that qiyas refers to inductive reasoning, which Ibn Hazm (994-1064) disagreed with, arguing that qiyas does not refer to inductive reasoning, but refers to categorical syllogism in a real sense and analogical reasoning in a metaphorical sense. On the other hand, al-Ghazali (1058-1111) (and in modern times, Abu Muhammad Asem al-Maqdisi) argued that qiyas refers to analogical reasoning in a real sense and categorical syllogism in a metaphorical sense. Other Islamic scholars at the time, however, argued that the term qiyas refers to both analogical reasoning and categorical syllogism in a real sense.[2]
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