An Ijma among the jurists cannot change fundamental rituals and rules of worship. Qiyas (Analogical Deduction) Qiyas is the fourth source of Shari'a, and it is used only when a matter has never been discussed under the above mentioned three sources. It is a process of deducing a rule from the earlier sources.
The differences between ijma and qiyas Ijma Qiyas. Definition Consensus of opinion of the companion of the prophet (sahabah), and the agreement reached on the decision taken by the learned muftis or the jurist on various Islamic matters. Legal principle introduced in order to derive at a logical conclusion of a certain law on a certain issue
The most important of these methods are ijma and qiyas. Ijma. Ijma could be defined as the unanimous agreement of the credible and authoritative Islamic religious scholars Differences of opinion are tolerated until a consensus emerges, and in the process, there is no room for compulsion or the imposition of ideas upon the community.
The main difference between ijtihad and the revealed sources of the Shari'ah lies in the fact that ijtihad is a continuous process of development whereas divine revelation and prophetic legislation discontinued upon the demise of the Prophet.
At the time of the death of the Prophet, there was a quarrel between the two groups for imamate (the temporal leadership of the religion). He discussed the science of Islamic law and interpretation such as Ijma'a (Consensus), Qiyas (Analogy), Ijthihad (Personal reasoning) Isthihsan (Juristic preference) and Ikhthilaf (Disagreement) in a
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difference between ijma and qiyas
