Al-Muhalla ("The Sweetened" or "The Adorned Treatise" ) is a book by Islamic scholar , The only book of his Legal rulings existent to date.
Al Kitab al-Muhallā bi'l Athār (The Book Ornamented with traditions)
It is his commentary on his own al-Mujalla ("The Brilliant Treatise"), and it is considered a masterpiece of fiqh literature .
A site describes it:
This book is a wealth of scholarship, in which Ibn Hazm discusses each question separately. On each question, he cites the views of earlier scholars of high achievement, not restricting himself to the views of the four schools of Fiqh, but also citing the rulings of scholars like al-Hassan al-Basri (d. 110), al-Laith ibn Saad (d. 175), Ata' (d. 114), Sufyan al-Thawri (d. 161), al-Awza'ie (d. 157), etc. He also quotes the evidence they cite in support of their views. He then discusses why he considers their views incorrect, and produces the evidence in support of his own view. This makes for a highly scholarly discussion. Many scholars describe Al-Muhalla as the encyclopaedia of Islamic Fiqh. Indeed, it has preserved many of the views of early scholars whose work was either not documented or lost. The only problem with Al-Muhalla is that Ibn Hazm is often scathing in his criticism of his opponents. Yet......