وَأَمَّا ٱلَّذِينَ فِي قُلُوبِهِم مَّرَضٞ فَزَادَتۡهُمۡ رِجۡسًا إِلَىٰ رِجۡسِهِمۡ وَمَاتُواْ وَهُمۡ كَٰفِرُونَ

Wa ammal lazeena fee quloobihim maradun fazaadat hum rijsan ilaa rijsihim wa maatoo wa hum kaafiroon

But those in whose hearts is a disease,- it will add doubt to their doubt, and they will die in a state of Unbelief.

— At-Taubah (ٱلتَّوْبَة), 9:125