based on the methodology established by the imam - founder of an Islamic mazhab - or based on the rules that have been established by the followers of the mazhab and accepted as valid methods of deducing laws in the mazhab. This article aims to study the historical development of ijtihad within the scope of a mazhab - Takhrij al-Furuʻ ʻala al-Usul. The focus of the research will be on t…