“The greatest affair which Allaah has commanded is His Tawheed (His Oneness in His Lordship, in His Right to be worshipped and in His Names and Attributes). And the greatest affair which Allaah has prohibited is Shirk (polytheism, setting up partners with Allaah in worship). So every da‘wah (call, invitation) which doesn’t give any importance to Tawheed and doesn’t give any importance to warning against Shirk, is a da‘wah which opposes the guidance of the Prophet – salla Allaahu ‘alayhi wa sallam ”