وَقالوا قُلوبُنا في أَكِنَّةٍ مِمّا تَدعونا إِلَيهِ وَفي آذانِنا وَقرٌ وَمِن بَينِنا وَبَينِكَ حِجابٌ فَاعمَل إِنَّنا عامِلونَ

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