Al Anfal Ayah 35

وَمَا كَانَ صَلَاتُهُمْ عِندَ ٱلْبَيْتِ إِلَّا مُكَآءً وَتَصْدِيَةً‌ۚ فَذُوقُواْ ٱلْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ ٣٥ Their prayer at the Sacred House was nothing but whistling and clapping. So taste the punishment for your disbelief.