The Four Major Sources
In classical Sunni Islam, there are four major sources of jurisprudence: the Qur'an, the Sunnah, ijma' (consensus), and qiyas (analogy).
There is some dispute amongst the Sunni jurists regarding ijma' and qiyas. The Zahirites in particular reject all forms of qiyas, and Dawud al-Zahiri, Abu Hanifa and Ahmad bin Hanbal only accepted ijma' al-sahaba (consensus of the companions of Muhammad).
Read more about this topic: Usul Al-fiqh
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