Ijazah, Arabic for permission or license, names the formal authorization a qualified Islamic scholar grants a student certifying that the student has mastered a specific text, subject or discipline well enough to transmit and teach it to others in turn. The practice developed as the primary mechanism of academic and religious certification across the classical Islamic educational system, applied to fields ranging from hadith transmission and Quranic recitation to law, theology and, within Sufi orders, spiritual guidance itself, an ijazah in a Sufi context authorizing the recipient to initiate and guide disciples within a particular order.
An ijazah traditionally names the specific work or body of knowledge covered, states the chain of transmission, isnad, connecting the granting scholar back through a sequence of earlier teachers, and is often accompanied by the student's own written record of study, creating a documentary trail scholars could in principle trace back for generations. The system gave classical Islamic scholarship a decentralized but rigorous form of credentialing that did not depend on any single central institution, since authority rested on the personal, traceable chain of teacher to student rather than on a diploma issued by an impersonal body.