Islamic family-law fatwas in Indonesia show how the epistemology of Islamic Family Law Fatwas among Majelis Ulama Indonesia (MUI), Nahdlatul Ulama (NU), and Muhammadiyah in Plural Indonesia, and Muhammadiyah respond to social change. The study addresses the tension between classical Islamic jurisprudence and contemporary realities that compel fatwas to engage complex family issues. Using a socio-legal approach and Islamic legal-theory analysis operationalized through content analysis of official fatwa documents and systematic cross-institutional comparison, the article examines four issues: minimum marriage age, interfaith marriage, women's public roles and maintenance, and divorce. The findings reveal three epistemic patterns. First, MUI, NU, and Muhammadiyah converge on contextual reasoning oriented toward the higher objectives of Islamic law when addressing issues in which state policy and Islamic law are mutually supportive, as seen in the shift from biological puberty to psychosocial maturity in marriage-age regulation and the proceduralisation of divorce through the Religious Courts. Second, the three authorities converge on a protective stance grounded in the principle of preventing harm when external norms are perceived to threaten religious identity, as in the case of interfaith marriage. Third, their reasoning becomes more elastic when addressing socio-economic realities, legitimising women as breadwinners and moderating absolutist readings of male household authority. Overall, fatwas emerge from a dialectic among revelation, public welfare, and state authority, confirming the relevance of KH. M.A. Sahal Mahfudh's Social Fiqh and Sayuti Thalib's Receptie a Contrario for reading Islamic law's influence on national law.
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