The call to prayer, which consisted originally of simply four takbirs followed by the statement (أَشْهَدُ أَنْ) لَا إِلٰهَ إِلَّا ٱلله ((ʔašhadu ʔan) lā ʔilāha ʔillā llāh).
Borrowed from Arabic أَذَان (ʔaḏān).
Practice speaking and memorizing "adhan" and many other words and sentences in English.