1) The Da’wah (call) to single Allaah out with ones worship, love and hate for Allaah’s sake is based upon this principle, those who do not embrace and live by this are declared to be disbelievers

2) Warning against shirk, associating partners in any type of worship with Allaah and being serious in this warning and having hatred for polytheism

Whoever would uphold these two principles, in truth, is a Muslim, a worshipper of Allaah, not worshipping other than him, having hope in Allaah alone. These are the two principles that all the Prophets and Messengers conformed to.