Word by Word Analysis

فَلَا تَحْسَبَنَّ ٱللَّهَ مُخْلِفَ وَعْدِهِۦ رُسُلَهُۥٓ ۗ إِنَّ ٱللَّهَ عَزِيزٌ ذُو ٱنتِقَامٍ 47

So never think that Allāh will fail in His promise to His messengers. Indeed, Allāh is Exalted in Might and Owner of Retribution.