A Finite Text, an Open World

The four Sunni schools all recognise qiyas as a legitimate source, but not in equal measure, and the disagreement traces to how confidently a jurist can claim to have identified the true operative cause behind a revealed ruling. The Hanafi school, historically centred in regions with active commercial life and comparatively fewer directly applicable texts, made the widest use of analogical reasoning among the four. The Hanbali school, more cautious about extending rulings beyond what a text explicitly states, applied qiyas more sparingly and only where little alternative existed. Outside the four schools that came to be regarded as the Sunni mainstream, the Zahiri school rejected qiyas altogether, holding that a jurist could never be certain enough of a text's underlying cause to extend it safely, and that law should be derived from the plain, literal sense of revealed text alone. The persistence of that rejected position, even as a minority view, is a reminder that qiyas being one of the four accepted sources was itself a contested outcome rather than an inevitability. Twelver Shia jurisprudence took a different route again: the Jafari school largely declined to adopt qiyas as the Sunni schools define it, relying instead on a narrower role for aql, reason, exercised by a qualified jurist within limits its own legal theory sets out separately.