Surah Al-Anfal (The Spoils of War), Verse 35

وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَیْتِ اِلَّا مُكَآءً وَّتَصْدِیَةً فَذُوْقُوا الْعَذَابَ بِمَا كُنْتُمْ تَكْفُرُوْنَ ۟

Wa maa kaana Salaatuhum 'indal Baiti illa mukaaa anw-wa tasdiyah; fazooqul 'azaaba bimaa kuntum takfuroon

“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."”

Quran 8:35 (Yusuf Ali Translation)