Al Anfal, 35 Ayah
8:35
وَمَا كَانَ صَلَاتُهُمۡ عِندَ ٱلۡبَيۡتِ إِلَّا مُكَآءٗ وَتَصۡدِيَةٗۚ فَذُوقُواْ ٱلۡعَذَابَ بِمَا كُنتُمۡ تَكۡفُرُونَ ٣٥
Wa Mā Kāna Şalātuhum `Inda Al-Bayti 'Illā Mukā'an Wa Taşdiyatan ۚ Fadhūqū Al-`Adhāba Bimā Kuntum Takfurūna
And their prayer at the House was not except whistling and handclapping. So taste the punishment for what you disbelieved.