SunniIslamic jurisprudence,the qiyas (Arabic قياس) is the process of analogical reasoning in which the teachings of the Quran are compared and contrasted with those of the Hadith, ie. 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 Sunnahand the Qur'anmay 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 precedentor paradigm and the new problem that has come about will share operative causes ("illah") [ [http://www.123exp-law.com/t/03784294639/ The Language of Law - Qiyas] ] . The "illah" is the specific set of circumstances that trigger a certain law into action. Both Sunni Islamand Shi'a Islamshare 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 approach to qiyas.
Example of qiyas
For example, qiyas is applied to the injunction against drinking
wineto create an injunction against cocaineuse.
# Identification of a clear, known thing or action that might bear a resemblance to the modern situation, such as the wine drinking.
# Identification of the ruling on the known thing. Wine drinking is
# Identification of the reason behind the known ruling (
'illah). For example, wine drinking is haraam because it intoxicates. Intoxication is bad because it removes Muslims from mindfulness of God. This reason behind the reason is termed " hikmah".
# The reason behind the known ruling is applied to the unknown thing. For instance cocaine use intoxicates the user, removing the user from mindfulness of God. It is therefore prohibited.
Islamic Golden Age, there was a logical debateamong Islamic logicians, philosophers and theologians over whether the term "qiyas" refers to analogical reasoning, inductive reasoningor 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. [Wael B. Hallaq (1993), "Ibn Taymiyya Against the Greek Logicians", p. 48. Oxford University Press, ISBN 0198240430.] Liberal movements within Islamoften extend qiyas by the disputed practice of " istihsan" in order to redefine Islamic lawaway from conservative and traditional forms.
hi'a view of qiyas
The Shi'a view the use of qiyas (analogy) as being an innovation which can easily lead the user to erroneous conclusions regarding matters of Fiqh. In Usul al-Kafi, in the chapter on knowledge, one finds many traditions cited from the Shi'a Imams that forbid the use of qiyas. For example:
:"H 103, Ch. 11, h 9
:"Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus from Dawad ibn Farqad from one he narrated from ibn Shubruma (a judge in al-Kufa during the rule of al-Mansur) who has said the following. :"I never heard any thing like a statement I heard from Imam abu ‘Abdallah (a.s.) and it is almost as he said, ‘Pierced my heart.’" The Imam (a.s.) said, "My father narrated from my great-great-great-great grandfather, the holy Prophet (s.a.) who said, ‘Those who act on the basis of analogy will face their destruction and lead others to their destruction. Those who give fatwas without the knowledge of the abrogating and the abrogated, the clear text and that which requires interpretation, they will face destruction and lead others to their destruction." [ [http://www.al-shia.com/html/eng/books/hadith/al-kafi/part2/part2-ch11.htm Prohibition on Speaking without Knowledge] ]
* [http://globalwebpost.com/farooqm/writings/islamic/qiyas_prob.html Qiyas (Analogical Reasoning) and Some Problematic Issues in Islamic law]
Mohammad Hashim Kamali, "Principles of Islamic Jurisprudence" (2003)
* [http://www.answering-ansar.org/answers/mutah/en/chap4.php Shi'a site] refuting multiple Qiyas regarding
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