3ذٰلِكَ بِأَنَّهُم آمَنوا ثُمَّ كَفَروا فَطُبِعَ عَلىٰ قُلوبِهِم فَهُم لا يَفقَهونَFaridul HaqueThat is because they accepted faith with their tongues then disbelieved with their hearts, therefore their hearts were sealed – so now they do not understand anything.