Surah Fusilat (The Verses Prefectly Explained), Verse 5

وَقَالُوْا قُلُوْبُنَا فِیْۤ اَكِنَّةٍ مِّمَّا تَدْعُوْنَاۤ اِلَیْهِ وَفِیْۤ اٰذَانِنَا وَقْرٌ وَّمِنْ بَیْنِنَا وَبَیْنِكَ حِجَابٌ فَاعْمَلْ اِنَّنَا عٰمِلُوْنَ ۟

Wa qaaloo quloobunaa feee akinnatim mimmaa tad'oonaaa ilaihi wa feee aazaaninaa waqrunw wa mim baininaa wa bainika hijaabun fa'mal innanaa 'aamiloon

“They say: "Our hearts are under veils, (concealed) from that to which thou dost invite us, and in our ears in a deafness, and between us and thee is a screen: so do thou (what thou wilt); for us, we shall do (what we will!)"”

Quran 41:5 (Yusuf Ali Translation)