Urf
ʿUrf (Arabic: عُرْف), commonly translated as custom or prevailing practice, constitutes a secondary source of Islamic jurisprudence (fiqh), wherein recurrent societal habits and traditions inform legal rulings provided they remain compatible with primary Sharia sources such as the Quran and Sunnah.[1][2] Defined as practices acceptable to individuals of sound reason and recurring within a community, ʿurf addresses ambiguities in scriptural language or gaps in explicit legislation by supplying contextual interpretations grounded in established norms.[1][3] The majority of Muslim jurists across major schools of thought affirm ʿurf's legitimacy as a source, differentiating between valid custom (ʿurf ṣaḥīḥ), which promotes benefit and equity without contravening divine injunctions, and invalid custom (ʿurf fāsid), which is rejected for its opposition to core Islamic principles.[4][5] This mechanism enables fiqh to adapt to diverse cultural contexts while preserving doctrinal integrity, influencing areas from contractual terms to evidentiary standards in Islamic legal application.[2][6]