8:35
وَمَا كَانَ صَلاَتُهُمْ عِندَ الْبَيْتِ إِلاَّ مُكَاء وَتَصْدِيَةً فَذُوقُواْ الْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ
Their prayer at the House (of Allah) is nothing but whistling and clapping of hands: (Its only answer can be), "Taste ye the penalty because ye blasphemed."