وَمَا كَانَ صَلاَتُهُمْ عِندَ الْبَيْتِ إِلاَّ مُكَاء وَتَصْدِيَةً فَذُوقُواْ الْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ
[8:35]
And their prayer before the House is nothing but whistling and clapping of hands; taste then the chastisement, for you disbelieved.
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."
And their worship at the (holy) House is naught but whistling and hand-clapping. Therefore (it is said unto them): Taste of the doom because ye disbelieve.