﴿ وَقَالُوا۟ قُلُوبُنَا غُلْفٌۢ ۚ بَل لَّعَنَهُمُ ٱللَّهُ بِكُفْرِهِمْ فَقَلِيلًۭا مَّا يُؤْمِنُونَ ﴾

“But they say, "Our hearts are already full of knowledge." Nay, but God has rejected them because of their refusal to acknowledge the truth: for, few are the things in which they believe.”

And they say: 'Our hearts are encased'. Nay, but God has cursed them for their unbelief; and little will they believe.