وَقَالُواْ قُلُوبُنَا غُلۡفُۢۚ بَل لَّعَنَهُمُ ٱللَّهُ بِكُفۡرِهِمۡ فَقَلِيلٗا مَّا يُؤۡمِنُونَ ٨٨
And they said, "Our hearts are wrapped."1 But, [in fact], Allāh has cursed them for their disbelief, so little is it that they believe.
Translation: Saheeh International (English)
1 Covered or sealed against reception of Allāh's word.
Each word's meaning and sound
The Israelites argued that their stubbornness was because their hearts were wrapped in a cover, so that none of what was said to them could reach them, or make sense to them. On the contrary, Allah deprived them of His mercy due to their disbelief, so that they will not have faith.
Al-Mukhtasar in interpreting the Noble Quran