Luqman 30

ذَٰلِكَ بِأَنَّ ٱللَّهَ هُوَ ٱلْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِ ٱلْبَـٰطِلُ وَأَنَّ ٱللَّهَ هُوَ ٱلْعَلِىُّ ٱلْكَبِيرُ

dhālika bi-anna l-laha huwa l-ḥaqu wa-anna mā yadʿūna min dūnihi l-bāṭilu wa-anna l-laha huwa l-ʿaliyu l-kabīru

That is because Allāh is the True Reality, and that what they call upon other than Him is falsehood, and because Allāh is the Most High, the Grand.