Calling to Allah's Religion

It is a brief valuable message includes the the principles that the person should know which are: 1-Knowing his lord and the types of worships that Allaah orders us to do 2-Knowing his religion,levels of religion and the pillars of each level 3-Knowing the prophet,a summary of his life and the wisdom of his mission In addition to mentioning belief in resurrection and the two pillars of monotheism which are:disbelief in false deities and belief in Allaah alone