8:35
وَمَا كَانَ صَلَاتُهُمْ عِندَ ٱلْبَيْتِ إِلَّا مُكَآءً وَتَصْدِيَةً ۚ فَذُوقُوا۟ ٱلْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ
wamā kāna ṣalātuhum ʿinda l-bayti illā mukāan wataṣdiyatan fadhūqū l-ʿadhāba bimā kuntum takfurūna
Their prayers before the House are nothing but whistling and clapping. ‘So taste the punishment for your disbelief.’
Their Salât (prayer) at the House (of Allâh, i.e. the Ka‘bah at Makkah) was nothing but whistling and clapping of hands. Therefore taste the punishment because you used to disbelieve.