سُورَةُ الأَنفَالِ
Surah Al-Anfaal·8:35
وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَيْتِ إِلَّا مُكَاءً وَتَصْدِيَةً ۚ فَذُوقُوا الْعَذَابَ بِمَا كُنْتُمْ تَكْفُرُونَ٣٥
and their prayers before the Temple are nothing but whistling and clapping of hands. Taste then, [O unbelievers,] this chastisement as an outcome of your persistent denial of the truth!