وَقالوا قُلوبُنا غُلفٌ ۚ بَل لَعَنَهُمُ اللَّهُ بِكُفرِهِم فَقَليلًا ما يُؤمِنونَ

And they said, "Our hearts are wrapped." But, [in fact], Allah has cursed them for their disbelief, so little is it that they believe.