The Book of the Adhan and the Sunnah Regarding It
كتاب الأذان والسنة فيها
Chapter 5: The Virtue Of The Adhan And The Reward Of The Mu'adh-dhin
"I heard Mu'awiyah bin Abu Sufyan say that Messenger of Allah said: "The Mu'adh-dhin will have the longest necks of all people on the Day of Resurrection."
"The Messenger of Allah said: 'Let the best of you give the call to prayer (Adhan), and let those who are most versed in the Qur'an lead you in prayer.'"
"The Messenger of Allah said: 'Whoever calls the Adhan for seven years, seeking reward (from Allah), Allah will decree for him deliverance from the Fire.'"
The Messenger of Allah said: "Whoever calls the Adhan for twelve years, he will be guaranteed Paradise, and for each day sixty Hasanat (good deeds) will be recorded for him by virtue of his Adhan, and thirty Hasanat by virtue of his Iqamah."
Chapter 6: Saying The Phrases Of The Iqamah Once
"They looked for something by means of which they could call out informing of (the time of) the prayer. Then Bilal was commanded to say the phrases of the Adhan twice and the phrases of the Iqamah once."
"Bilal was commanded to say the phrases of the Adhan twice and the phrases of the Iqamah once."
In the Adhan of Bilal, the phrases were two by two, and in his Iqamah they were said once.
"I saw Bilal calling the Adhan in fron of Allah's Messenger, (saying the phrases) two by two, and saying each phrase once in the Iqamah."
Chapter 7: If The Adhan Is Called And You Are In The Mosque, Then Do Not Leave
"We were sitting in the mosque with Abu Hurairah when the Mu'adh-dhin called the Adhan. A man got up and walked out of the mosque, and Abu Hurairah followed him with his gaze until he left the mosque. Then Abu Hurairah said: "This man has disobeyed Abul-Qasim.'"
"The Messenger of Allah said: 'Whoever hears the Adhan when he is in the mosque, then goes out and does not go out for any (legitimate) need and does not intend to return, is a hypocrite.'"