State of the heart (qalb)

مُهْطِعِينَ مُقْنِعِى رُءُوسِهِمْ لَا يَرْتَدُّ إِلَيْهِمْ طَرْفُهُمْ ۖ وَأَفْـِٔدَتُهُمْ هَوَآءٌ

Racing ahead, their heads raised up, their glance does not come back to them, and their hearts are void.