Narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that when the Muslims came to Madinah, they used to estimate the time and gather to perform the prayer, and no one would make a call or anything similar. One day, the Muslims consulted each other about informing for prayer, whether they should ring a bell like the Christians or blow a horn like the Jews. Then Sayyiduna Umar (may Allah be pleased with him) suggested that a man should be appointed to inform the people for prayer. Upon this, the Messenger of Allah (peace and blessings be upon him) said, "O Bilal! Stand up and announce the prayer."

It is narrated from Sayyiduna Abu Mahdhurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) taught him the Adhan in this way: Allahu Akbar, Allahu Akbar. (In the other narrations, Allahu Akbar is said four times.) Ashhadu an la ilaha illallah, Ashhadu an la ilaha illallah. Ashhadu anna Muhammadur Rasulullah, Ashhadu anna Muhammadur Rasulullah. Then he should repeat: Ashhadu an la ilaha illallah, Ashhadu an la ilaha illallah. Ashhadu anna Muhammadur Rasulullah, Ashhadu anna Muhammadur Rasulullah. Hayya ‘ala-s-Salah, twice. Hayya ‘ala-l-Falah, twice. Ishaq states that after this, he should say: Allahu Akbar, Allahu Akbar. La ilaha illallah.

'Sayyiduna Anas (may Allah be pleased with him) reports that Sayyiduna Bilal (may Allah be pleased with him) was instructed to say the words of the adhan twice each, and the words of the iqamah once each. And Yahya added from Ibn 'Ulayyah that I asked Ayub about this, and he said that in the iqamah only the words "Qad qamatis salah" should be said twice.'

Narrated Ibn Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings of Allah be upon him) had two muezzins. One was Bilal (may Allah be pleased with him) and the other was Abdullah bin Umm Maktum (may Allah be pleased with him), who was blind.

Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) says that Sayyiduna Ibn Umm Maktum (may Allah be pleased with him) used to give the call to prayer (adhan) for the Messenger of Allah (peace and blessings be upon him), and he was blind.

Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) would attack the enemy early in the morning and would listen attentively for the sound of the adhan. If he heard the sound of the adhan (from the opponents’ city), he would not attack them. Once, he heard a man saying "Allahu Akbar, Allahu Akbar," so he said, "He is a Muslim." After that, he heard him say, "Ashhadu an la ilaha illallah, ashhadu an la ilaha illallah," so he said, "O man, you have been saved from the Fire." When people looked, he was a shepherd of goats.

It is narrated from Sayyiduna Abu Huraira, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: When the call to prayer (adhan) is given, Satan turns his back and flees while passing wind so that he does not hear the adhan. After the adhan, he returns, and when the iqamah (second call to prayer) is pronounced, he again flees. After the iqamah, he comes back and puts whispers into a person's heart and reminds him of things which he had not even thought of before the prayer, so much so that the person does not remember how many rak‘ahs he has prayed.

‘Isa bin Talhah says that I was with Sayyiduna Muawiyah bin Abi Sufyan (may Allah be pleased with him) when the muezzin came to call him for prayer. Upon this, Sayyiduna Muawiyah (may Allah be pleased with him) said that I heard the Messenger of Allah (peace and blessings be upon him) say that on the Day of Resurrection, the necks of the muezzins will be the longest.

Narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings of Allah be upon him) say: When you hear the call of the muezzin, say what the muezzin says, then send blessings upon me, for whoever sends blessings upon me, Allah will send ten mercies upon him. After that, ask Allah to grant me al-Wasilah, for al-Wasilah is a place in Paradise which will be given to only one of Allah’s servants, and I hope that I will be that servant. And whoever asks Allah for al-Wasilah (the praised station, i.e., a place in Paradise) for me, my intercession will become obligatory for him.

Sayyiduna Umar bin Khattab (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: When the muezzin says "Allahu Akbar, Allahu Akbar," the listener should also repeat these words, and when he says "Ashhadu an la ilaha illallah" and "Ashhadu anna Muhammadan Rasulullah," the listener should also repeat these words. And when the muezzin says "Hayya 'ala-s-Salah," the listener should say "La hawla wa la quwwata illa billah," then when the muezzin says "Hayya 'ala-l-Falah," the listener should also say "La hawla wa la quwwata illa billah." After this, when the muezzin says "Allahu Akbar, Allahu Akbar" and "La ilaha illallah," the listener should also repeat these words. And when the listener says this with sincerity and firm belief, he will enter Paradise (provided that he also adheres to the pillars of Islam).