Surah Al-Anfal, Verse 35

وَمَا كَانَ صَلَاتُهُمۡ عِندَ ٱلۡبَيۡتِ إِلَّا مُكَآءࣰ وَتَصۡدِيَةࣰۚ فَذُوقُواْ ٱلۡعَذَابَ بِمَا كُنتُمۡ تَكۡفُرُونَ ﴿٣٥﴾

Ve ma kane salatühüm ındel beyti illa mükaev ve tasdiyeh fe zukul azabe bi ma küntüm tekfürun

“Their prayer at the House (of God) is nothing but whistling and clapping of hands: (Its only answer can be), "Taste ye the penalty because ye blasphemed”