ذَٰلِكَ بِأَنَّهُمۡ ءَامَنُواْ ثُمَّ كَفَرُواْ فَطُبِعَ عَلَىٰ قُلُوبِهِمۡ فَهُمۡ لَا يَفۡقَهُونَ ٣
Dhālika biʾannahum āmanū thumma kafarū faṭubiʿa ʿalā qulūbihim fahum lā yafqahūn.
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.
Translation: Sahih International