Surah Al-Ma'idah — Ayah 58 (5:58)
وَإِذَا نَادَيۡتُمۡ إِلَى ٱلصَّلَوٰةِ ٱتَّخَذُوهَا هُزُوٗا وَلَعِبٗاۚ ذَٰلِكَ بِأَنَّهُمۡ قَوۡمٞ لَّا يَعۡقِلُونَ ٥٨
English translation (Saheeh International)
And when you call to prayer, they take it in ridicule and amusement. That is because they are a people who do not use reason.
Brief commentary
They also poke fun and play when you call towards prayer, which is the greatest act of worship. That is because they are a nation who do not understand the meaning of worship of Allah and they do not understand the sacred laws that Allah has made.