Surah Luqman 31:30

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

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.

Translation: Saheeh International

Tafsir

That which is mentioned is so because God He is the Truth the established truth and whatever they call on read yad‘ūna; or tad‘ūna ‘you call on’ whatever they worship besides Him is evanescent falsehood and because God is the High Exalted above His creation by virtue of His subjugation of them the Great the Mighty.

Excerpt from Tafsir al-Jalalayn, commentary on 31:30, via Quran.com. The reader has the full commentary and 9 more tafsirs.