Al Munafiqun, 3 Ayah
63:3
ذَٰلِكَ بِأَنَّهُمۡ ءَامَنُواْ ثُمَّ كَفَرُواْ فَطُبِعَ عَلَىٰ قُلُوبِهِمۡ فَهُمۡ لَا يَفۡقَهُونَ ٣
Dhālika Bi'annahum 'Āmanū Thumma Kafarū Faţubi`a `Alá Qulūbihim Fahum Lā Yafqahūna
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.