This document discusses the Islamic legal principle of al-Qiyas (analogical reasoning). It begins by defining al-Qiyas as extending a Sharia ruling from an original case to a new case if they share the same effective cause or 'illah. The bases of al-Qiyas include Quranic verses, hadiths of the Prophet Muhammad, and scholarly consensus. The pillars of al-Qiyas are the original case, new case, effective cause or 'illah, and ruling. There are also conditions for each pillar. The document provides examples of different types of al-Qiyas and discusses cases where scholars have applied analogical reasoning.