3ذٰلِكَ بِأَنَّهُم آمَنوا ثُمَّ كَفَروا فَطُبِعَ عَلىٰ قُلوبِهِم فَهُم لا يَفقَهونَM. H. ShakirThat is because they believe, then disbelieve, so a seal is set upon their hearts so that they do not understand.