وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَيْتِ إِلَّا مُكَاءً وَتَصْدِيَةً ۚ فَذُوقُوا الْعَذَابَ بِمَا كُنْتُمْ تَكْفُرُونَ

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And their prayer at the House was not except whistling and handclapping. So taste the punishment for what you disbelieved.