Al-Maaida 5:58

When you give the call to prayer[51], they ridicule it and make fun of it; that is because they are people who have no understanding.

[51] Al-Salāh (prayer) is singled out here for it is the most apparent distinctive feature of the Muslim community.

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.

58. And when you proclaim the call for As-Salât [call for the prayer (Adhân)], they take it (but) as a mockery and fun; that is because they are a people who understand not.[20]

[20] (V.5:58) How the Adhân (the call to prayer)* for the prayer was started. And the Statement of Allâh عز وجل:
"And when you proclaim the call to prayer (Adhân ) they take it (but) as a mockery and fun; that is because they are a people who understand not." (V.5:58).
And also the Statement of Allâh عز وجل: "When the call (Adhân ) for the prayer is proclaimed on the day of Friday." (V.62:9).
Narrated Anas رضي الله عنه: The people mentioned the fire and the bell (they suggested those as signals to indicate the starting of prayers), and by that they mentioned the Jews and the Christians, then Bilâl was ordered to pronounce Adhân for the prayer by saying its wordings twice (in doubles), and for the Iqâmah (the call for the actual standing for the prayers in rows) by saying its wordings once (in singles) (Iqâmah is pronounced when the people are ready for the prayer). (Sahih Al-Bukhâri, Vol.1, Hadîth No.577).
* The wording of Adhân : Allâhu-Akbar, Allâhu-Akbar, Allâhu-Akbar, Aâhu-Akbar; Ash-hadu an lâ ilaha illallâh, Ash-hadu an lâ ilâha illallâh; Ash-hadu anna Muhammad-ar Rasûl-Ullâh, Ash-hadu anna Muhammad-ar-Rasûl-Ullâh; Hayya-‘alas-Salâh, Hayya ‘alas-Salâh; Hayya ‘alal-Falâh, Hayya ‘alal-Falâh; Allâhu-Akbar, Allâhu-Akbar; Lâ ilâha illallâh.

And when ye call to prayer they take it for a jest and sport. That is because they are a folk who understand not.