Hardening of the Heart

فِى قُلُوبِهِم مَّرَضٌ فَزَادَهُمُ ٱللَّهُ مَرَضًا ۖ وَلَهُمْ عَذَابٌ أَلِيمٌۢ بِمَا كَانُوا۟ يَكْذِبُونَ

In their hearts is disease, so Allāh has increased their disease; and for them is a painful punishment because they [habitually] used to lie.

إِنَّ ٱلَّذِينَ كَفَرُوا۟ وَظَلَمُوا۟ لَمْ يَكُنِ ٱللَّهُ لِيَغْفِرَ لَهُمْ وَلَا لِيَهْدِيَهُمْ طَرِيقًا

Indeed, those who disbelieve and commit wrong [or injustice] - never will Allāh forgive them, nor will He guide them to a path,

كَلَّا ۖ بَلْ ۜ رَانَ عَلَىٰ قُلُوبِهِم مَّا كَانُوا۟ يَكْسِبُونَ

No! Rather, the stain has covered their hearts of that which they were earning.