The Explanation Of The Three Fundamental Principles
Author: Dr. Saalih Bin Fawzaan Al-Fawzaan
Paperback: 379 pages
So these are called Usool because other than it, from the affairs of the religion, are built upon them. Due to this, they are called Usool; because the matter of the religion is built upon them and all of the religion revolves around these three principles.