Al-Ma'idah' - 5:58

وَإِذَا نَادَيْتُمْ إِلَى الصَّلاَةِ اتَّخَذُوهَا هُزُوًا وَلَعِبًا ذَلِكَ بِأَنَّهُمْ قَوْمٌ لاَّ يَعْقِلُونَ
[5:58]
And when you call to prayer they make it a mockery and a joke; this is because they are a people who do not understand.
When ye proclaim your call to prayer they take it (but) as mockery and sport; that is because they are a people without understanding.
And when ye call to prayer they take it for a jest and sport. That is because they are a folk who understand not.