ذٰلِكَ بِأَنَّ اللَّهَ هُوَ الحَقُّ وَأَنَّ ما يَدعونَ مِن دونِهِ الباطِلُ وَأَنَّ اللَّهَ هُوَ العَلِيُّ الكَبيرُ

That is because Allah is the Truth, and that what they call upon other than Him is falsehood, and because Allah is the Most High, the Grand.