Ibn Hazm (384 H - 456 H) dilahirkan di Cordoba di Andalusia (Sepanyol), yang pada masa itu merupakan ibu kota ilmu pengetahuan bagi seluruh Eropah. Beliau mempelajari al-Qur'an, Hadith, dan Fiqh Maliki. Kemudian beliau berpindah untuk mempelajari Fiqh Syafi'i, lalu meninggalkannya. Selepas itu, beliau berpindah untuk mempelajari mazhab Abu Dawud Az-Zahiri daripada Mas'ud bin Sulaiman.

Ibn Hazm (384 AH - 456 AH) was born in Cordoba in Andalusia (Spain), which at that time was the capital of science for all of Europe. He studied Qur‟an, Hadith, and Maliki Fiqh. He then moved to study Shafi‟i‟ Fiqh, and left it. Later on, he moved to study about the Madhab of Abu Dawud Az-Zahiri from Mas‟ood bin Sulayman.

Ibn Hazm menolak Qiyas dan hanya mengambil makna harfiah nas, sehingga jika seorang lelaki kencing di dalam sebuah takungan air, misalnya, beliau akan menganggap air itu najis; namun, jika air kencing itu daripada babi, maka air itu tidak dianggap najis. Ibn Hazm memerangi Taqlid dan menyeru orang ramai supaya membincangkan isu-isu berdasarkan dalil. Ini menyebabkan beliau menghadapi beberapa masalah daripada sebahagian orang pada zaman itu. Kitab beliau yang paling penting ialah Al-Muhalla.

Ibn Hazm rejected Qiyas and took only the literal meaning of the text to the point that if a man urinated in a body of water; for example, he would consider for the water Najis (filthy); however, if the urine were from a pig, then the water would not be considered as najis. Ibn Hazm fought against Taqleed and called the people to discuss issues based on the Daleel. This caused him some problems from some people at that time. His most important book is Al-Muhalla.