Essential Q & A Concerning the Foundations of Eemaan
The Day Of Judgement And Preparing For The Hereafter
The Explanation Of Three Fundamental Principles By Shaykh Dr. Saalih Al-Fawzaan
Shaykh Saalih Al-Fawzaan said:
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.