Surah Al-Baqarah 2:88

وَقَالُوا۟ قُلُوبُنَا غُلْفٌۢ ۚ بَل لَّعَنَهُمُ ٱللَّهُ بِكُفْرِهِمْ فَقَلِيلًا مَّا يُؤْمِنُونَ

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

Translation: Saheeh International

Tafsir

And they say to the Prophet mockingly ‘Our hearts are encased’ ghulf is the plural of aghlaf that is to say wrapped up in covers and cannot comprehend what you say; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:88, via Quran.com. The reader has the full commentary and 9 more tafsirs.