The Nature of Fasting By Shaykh al-Islam Ibn Taymiyyah
This book will help the reader better understand the fine points about fasting. What is the nature of the things that break the fast? What are the rules by which one can know the difference between what breaks the fast and what does not?
These question are more answered by Shaykh Al-Islam Ibn Taymiyyah in his discussion of the Nature of Fasting.