الانفال — Al-Anfal Ayat 35

وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَيْتِ اِلَّا مُكَاۤءً وَّتَصْدِيَةًۗ فَذُوْقُوا الْعَذَابَ بِمَا كُنْتُمْ تَكْفُرُوْنَ

Wa mā kāna ṣalātuhum ‘indal-baiti illā mukā'aw wa taṣdiyah(tan), fa żūqul-‘ażāba bimā kuntum takfurūn(a).

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