Introduction about azan
The Azan or adhan (in Arabic: أَذَان ) is the islamic call for congregational prayer, recited by the Muazzin at prescribed times of prayer 5 times a the day.
The root of the word azan is ʾadhina أَذِنَ meaning “to listen, to hear, be informed about”. Another derivative of the word azan is ʾudhun (أُذُن), meaning “ear”.
Adhan is called out by a Muazzin from the masjid or mosque 5 times a day, traditionally from the Minaret, summoning muslims for obligatory (fard) prayer (salat).
A second call, which is known as iqama, (set up) then summons Muslims to line up in a row for the beginning of the prayers or salat.
The main purpose for azan is not only summons people for Prayer but it also to remind them about Almighty with different sentences
It can be done with the help of or without mic and loudspeakers as per requirement
Origin of azan
Narrated AbuUmayr ibn Anas:
AbuUmayr reported on the authority of his uncle who was from the Ansar (the helpers of the Prophet): The Prophet (ﷺ) was anxious as to how to gather the people for prayer.
The people told him: Hoist a flag at the time of prayer; when they see it, they will inform one another. But he (the Prophet) did not like it. Then someone mentioned to him the horn.
Ziyad said: A horn of the Jews. He (the Prophet) did not like it. He said: This is the matter of the Jews. Then they mentioned to him the bell of the Christians. He said: This is the matter of the Christians.
Abdullah ibn Zayd returned anxiously from there because of the anxiety of the Apostle (ﷺ). He was then taught the call to prayer in his dream. Next day he came to the Messenger of Allah (ﷺ) and informed him about it.
He said: Messenger of Allah, I was between sleep and wakefulness; all of a sudden a newcomer came (to me) and taught me the call to prayer. Umar ibn al-Khattab had also seen it in his dream before, but he kept it hidden for twenty days.
The Prophet (ﷺ) said to me (Umar): What did prevent you from saying it to me?
He said: Abdullah ibn Zayd had already told you about it before me: hence I was ashamed.
Then the Messenger of Allah (ﷺ) said: Bilal, stand up, see what Abdullah ibn Zayd tells you (to do), then do it. Bilal then called them to prayer.
Abu Bishr reported on the authority of Abu Umayr: The Ansar thought that if Abdullah ibn Zayd had not been ill on that day, the Messenger of Allah (ﷺ) would have made him mu’adhdhin.
Grade: Hasan : Sunan Abi Dawud 498
Book 2. Hadith 108