63:3
ذَٰلِكَ بِأَنَّهُمْ ءَامَنُوا۟ ثُمَّ كَفَرُوا۟ فَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
Zaalika bi annahum aamanoo summa kafaroo fatubi'a 'alaa quloobihim fahum laa yafqahoon
That is because they believe, then disbelieve, so a seal is set upon their hearts so that they do not understand.
