This ˹Qur'an˺ is notification for the people that they may be warned thereby and that they may know that He is but one God and that those of understanding will be reminded.  

هَٰذَا بَلَاغٌ لِلنَّاسِ وَلِيُنْذَرُوا بِهِ وَلِيَعْلَمُوا أَنَّمَا هُوَ إِلَٰهٌ وَاحِدٌ وَلِيَذَّكَّرَ أُولُو الْأَلْبَابِ