The Unity of Revelation: The destructive consequence of rejecting the clear book.
The reason for their punishment is that God sent the Book (the Qur'an) with truth, and yet those who differ over it are in a destructive, deep schism. Prioritize unity through revelation. Differences over truth should lead to sincere scholarship, not sectarian division. Recognize that willful disagreement over clear revelation is a major source of communal destruction.