This document introduces the concept of al-Ijma' in Islamic law. It defines al-Ijma' as the unanimous consensus of qualified legal scholars (mujtahidun) on matters of Islamic jurisprudence. It outlines the basis of al-Ijma' in Islamic scripture and legal theory. It also discusses the conditions necessary for a valid consensus, such as unanimity of opinion among scholars of a single time period. Finally, it differentiates between explicit (sarih) and implicit (sukuti) forms of consensus.