Introduction

Al-Ihkam fi Usul al-Ahkam by Abu Muhammad Ali ibn Ahmad ibn Hazm al-Andalusi (384–456 AH / 994–1064 CE) is the definitive statement of Dhahiri legal theory and one of the most intellectually formidable works in the classical Islamic tradition. Ibn Hazm was born in Cordoba into a family of administrative prominence and received a thorough education in the sciences of his age. After early engagement with Maliki fiqh, he arrived at the Dhahiri school and became its most articulate and combative advocate, producing works across law, hadith, theology, heresiography, and literature that remain landmarks of Andalusian Islamic scholarship. He died at Niebla in relative isolation, having alienated many contemporaries through his polemical directness, yet his influence on subsequent scholarship — particularly in hadith-oriented and Salafi currents — has proven lasting and profound.

The central and defining feature of Ibn Hazm's legal methodology is his categorical rejection of qiyas, the analogical reasoning upon which the four established Sunni madhhabs rely extensively. For Ibn Hazm, the revealed texts — Quran and authenticated Sunnah — are sufficient to address every legal question, provided they are read according to their manifest, apparent (zahir) meaning without the speculative extension that qiyas requires. He argued that qiyas introduces human conjecture into divine law, corrupting what should be a purely text-derived system. This position is argued across al-Ihkam with extraordinary thoroughness: Ibn Hazm examines and refutes the arguments for qiyas marshaled by Hanafi, Maliki, Shafi'i, and Hanbali scholars, engaging them on their own terms before dismantling each line of reasoning.

Despite this rejection, Ibn Hazm's work is not a retreat from rational engagement but rather a redirection of it. He develops a sophisticated theory of textual interpretation grounded in Arabic linguistics, arguing that the apparent meanings of Quranic and hadith texts, understood according to the conventions of classical Arabic, yield sufficiently determinate rulings without interpretive supplementation. His chapters on naskh (abrogation), the authority of ijma' (which he restricts to the consensus of the Companions alone), and the epistemological status of khabar al-wahid (solitary narrations) represent independent contributions to usul al-fiqh that reward careful study regardless of one's agreement with his conclusions.

Al-Ihkam is also an important historical source for understanding the full range of positions within classical Islamic jurisprudence. Ibn Hazm preserves and engages with scholarly opinions that might otherwise be lost, and his polemical style — while challenging — has the virtue of stating opposing positions with enough fidelity that the dialectical stakes are clear. Scholars within the four madhhabs found him a formidable interlocutor rather than a marginal voice, and responses to his arguments were written across multiple generations. His influence on later hadith scholars, particularly those inclined toward direct textual application over legal school tradition, is well documented.

Readers should approach this work with an understanding that Ibn Hazm writes as an advocate with full command of classical scholarship, not as a neutral surveyor of the field. His arguments are precise, his citations extensive, and his tone unflinching. Within the framework of Ahl us-Sunnah wal-Jama'ah, the Dhahiri methodology occupies a recognized if minority position with genuine textual grounding. Engaging seriously with Ibn Hazm's arguments deepens understanding of why the questions he raises — about the limits of legal reasoning, the authority of transmitted texts, and the proper relationship between evidence and ruling — remain live and consequential in Islamic scholarly discourse.