Surah Al-Anfal, Ayah 35
Quran 8:35 · The Spoils of War · Madani · Para 9 · Page 181
وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَیْتِ اِلَّا مُكَآءً وَّتَصْدِیَةً ؕ فَذُوْقُوا الْعَذَابَ بِمَا كُنْتُمْ تَكْفُرُوْنَ ۟
Transliteration
Wama kana salatuhumAAinda albayti illa mukaan watasdiyatan fathooqooalAAathaba bima kuntum takfuroon
Saheeh International
And their prayer at the House [i.e., the Kaʿbah] was not except whistling and handclapping. So taste the punishment for what you disbelieved [i.e., practiced of deviations].
Al-Mukhtasar fi Tafsir
The prayer of the idolaters at the Sacred Mosque was nothing but whistling and clapping. So taste, O idolaters, the punishment of being killed or taken prisoner on the day of Badr because of your disbelief in Allah and rejection of His Messenger.
Tafsir Ibn Kathir (abridged)
Explains 8:34–8:35 together — read it on 8:34