Sharh Usool-ith-Thalaathah – Shaykh Fawzan Hafithahu Allah: From the Second Principle, knowledge of the religion, onward.

Sh. Salih Al-Fawzan said, “So these are called Usool (principles) 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.”