Fussilat 41:5

وَقَالُوا۟ قُلُوبُنَا فِىٓ أَكِنَّةٍ مِّمَّا تَدْعُونَآ إِلَيْهِ وَفِىٓ ءَاذَانِنَا وَقْرٌ وَمِنۢ بَيْنِنَا وَبَيْنِكَ حِجَابٌ فَٱعْمَلْ إِنَّنَا عَـٰمِلُونَ

Waqālū qulūbunā fī akinnatin mimmā tadʿūnā ilayhi wafī ādhāninā waqrun wamin bayninā wabaynika ḥijābun fa-iʿ'mal innanā ʿāmilūna

And they say, "Our hearts are within coverings [i.e., screened] from that to which you invite us, and in our ears is deafness, and between us and you is a partition, so work;¹ indeed, we are working."