3ذٰلِكَ بِأَنَّهُم آمَنوا ثُمَّ كَفَروا فَطُبِعَ عَلىٰ قُلوبِهِم فَهُم لا يَفقَهونَA. J. ArberryThat is because they have believed, then they have disbelieved; therefore a seal has been set on their hearts, and they do not understand.