Adhan with English Translation

Adhan (Arabic: أَذَان [ʔaˈðaːn]; also variously written as azan, adhaan, athan, adhane (French), azaan (Persian, Dari, Pashto, Bengali, Urdu, and Punjabi), adzan (Indonesian and Malaysian), and ezan (Turkish), among other languages) is the Islamic call to prayer (Salah) recited by a muezzin at prescribed times of the day. The root of the word is ʾadhina أَذِنَ meaning "to listen, to hear, be informed about". Another derivative of this word is ʾudhun (أُذُن), meaning "ear".

Adhan is recited loudly from the mosque five times a day on most days and all day long during the religious holidays of Eid al-Fitr and Eid al-Adha, traditionally from the minaret. It is the first call summoning Muslims to enter the mosque for obligatory (fard) prayer (salah). A second call, known as the iqamah summons those within the mosque to line up for the beginning of the prayers. The main purpose behind the multiple loud pronouncements of adhan in every mosque is to make available to everyone an easily intelligible summary of Islamic belief. In modern times, loudspeakers have been installed on minarets for this purpose. Only in Turkey, Ezan is voiced in five different styles at different times; saba, uşşak, hicaz, rast, segah.

The muezzin (Arabic: مُؤَذِّن muʾaḏḏin) is the person who recites the Adhan: 470  from the mosque. Typically in modern times, this is done using a microphone: a recitation that is consequently broadcast to the speakers usually mounted on the higher part of the mosque's minarets, thus calling those nearby to prayer. However, in many mosques, the message can also be recorded. This is due to the fact that the "call to prayer" has to be done loudly and at least five times a day. This is usually done by replaying previously recorded "call to prayer" without the presence of a muezzin. This way, the mosque operator has the ability to edit or mix the message and adjust the volume of the message while also not having to hire a full-time muezzin or in case of the absence of a muezzin. This is why in many Muslim countries, the sound of the prayer call can be exactly identical between one mosque and another, as well as between one Salah hour and another, as is the case for the London Central Mosque. In the event of a religious holidays like Eid al-Fitr, for example in Indonesia, where the Kalimah (speech) has to be recited out loud all day long, mosque operators uses this recording method to create a looping recital of the Kalimah.

The muezzin is chosen for his ability in reciting the Adhan clearly, melodic and loudly for all Muslims to hear. This is one of the important duties in the mosque, as his companions and community rely on him in his call for Muslims to come to pray in congregation.[weasel words] The Imam leads the prayer five times a day. The first muezzin in Islam was Bilal ibn Rabah, a freed slave of Abyssinian heritage.

Sunni
Sunnis state that the adhan was not written or said by the Islamic prophet, Muhammad, but by one of his Sahabah (his companions). Abdullah ibn Zayd, a sahabi of Muhammad, had a vision in his dream, in which the call for prayers was revealed to him by God. He later related this to his companions. Meanwhile, this news reached Muhammad, who confirmed it. Because of his stunning voice Muhammad chose a freed Habeshan slave by the name of Bilal ibn Rabah al-Habashi to make the call for prayers. Muhammad preferred the call better than the use of bells (as used by the Christians) and horns (as by the Jews).

Shia sources state Muhammad, according to God's command, ordered the adhan as a means of calling Muslims to prayer. Shia Islam teaches that no one else contributed, or had any authority to contribute, towards the composition of the adhan.

Shia sources also narrate that Bilal ibn Rabah al-Habashi was, in fact, the first person to recite the Adhan publicly out loud in front of the Muslim congregation.