Quran 41:5 from Surah Fussilat on Divine Marvels.
وَقَالُواْ قُلُوبُنَا فِيٓ أَكِنَّةٖ مِّمَّا تَدۡعُونَآ إِلَيۡهِ وَفِيٓ ءَاذَانِنَا وَقۡرٞ وَمِنۢ بَيۡنِنَا وَبَيۡنِكَ حِجَابٞ فَٱعۡمَلۡ إِنَّنَا عَٰمِلُونَ
English translation: And they say Our hearts (are) in coverings from what you call us to it and in our ears (is) deafness and between us and between us and between you (is) a screen So work indeed, we (are) working
Transliteration: waqalu qulubuna fi akinnatin mimma tad'una ilayhi wafi adhanina waqrun wamin baynina wabaynika hijabun fa-i'mal innana amiluna