Lesson in the Fundamentals of Islamic Monotheism (tawheed), from Qawaid al-Arba’a (The Four Principles) of Shaykh Muhammad ibn Abdul Wahhaab.

This is based on a treatise in which the Shaykh discusses and brings the evidence for four principles; about knowing the kufaar, knowing what they worship, that they differ in their religions, and the mushrikeen of now are worse than those before.