ذَٰلِكَ بِأَنَّهُمْ ءَامَنُوا۟ ثُمَّ كَفَرُوا۟ فَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
Zaalika bi annahum aamanoo summa kafaroo fatubi'a 'alaa quloobihim fahum laa yafqahoon
Saheeh International
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.