Allah's power and ability to punish

مِن قَبْلُ هُدًى لِّلنَّاسِ وَأَنزَلَ ٱلْفُرْقَانَ ۗ إِنَّ ٱلَّذِينَ كَفَرُوا۟ بِـَٔايَـٰتِ ٱللَّهِ لَهُمْ عَذَابٌ شَدِيدٌ ۗ وَٱللَّهُ عَزِيزٌ ذُو ٱنتِقَامٍ

Before, as guidance for the people. And He revealed the Criterion [i.e., the Qur’ān]. Indeed, those who disbelieve in the verses of Allāh will have a severe punishment, and Allāh is Exalted in Might, the Owner of Retribution.