Al-Anfâl 8:35
وَمَا كَانَ صَلَاتُهُمْ عِندَ الْبَيْتِ إِلَّا مُكَاءً وَتَصْدِيَةً ۚ فَذُوقُوا الْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ ٣٥
Wama kana salatuhum AAinda albayti illa mukaan watasdiyatan fathooqoo alAAathaba bima kuntum takfuroona
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And their prayer at the House is nothing but a whistling and a clapping of hands -- therefore taste you now the chastisement for your unbelief! (8:35)