‘Abdullāh ibn Zayd (may Allah be pleased with him) reported: When the Messenger of Allah (may Allah's peace and blessings be upon him) ordered that a bell be rung to gather the people for prayer, I saw a dream where a man was going around carrying a bell. I said to him: "O slave of Allah, are you selling this bell?" He said: "What will you do with it?" I said: "We will call the people to prayer." He said: "Shall I direct you to what is better than it?" I replied: ‘Yes.’ He said: "Say: 'Allah is the Greatest (four times); I bear witness that there is no god but Allah (twice); I bear witness that Muhammad is the Messenger of Allah (twice); come to prayer (twice); come to success (twice); Allah is the Greatest (twice); there is no god but Allah.'" Then he stood close behind me and said: "Then, when the prayer is about to begin, say: 'Allah is the Greatest (twice); I bear witness that there is no god but Allah; I bear witness that Muhammad is the Messenger of Allah; come to prayer; come to success; the prayer is about to commence (twice) [In another narration: “And if it is the Fajr prayer, say: ‘prayer is better than sleep (twice).’”]; Allah is the Greatest (twice); there is no god but Allah.'" When I woke up, I went to the Messenger of Allah (may Allah's peace and blessings be upon him) and informed him of my dream. He said: ‘Indeed, it is a true dream, Allah Willing! Go and teach these words to Bilāl, and let him make the call to prayer with them, as his voice is more melodious than yours.’ So I took Bilāl and taught him those words, and he made the call to prayer therewith. ‘Umar ibn al-Khattāb heard it while at home, and so he came out dragging his garment and saying: "By the One Who sent you with the truth, O Messenger of Allah, I saw the same dream that he saw!" Thereupon, the Prophet (may Allah's peace and blessings be upon him) said: "All praise is due to Allah."
Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "The most burdensome prayers for the hypocrites are the ‘Ishā and Fajr prayers. If they were to know the virtue of them, they would come to them even if they had to crawl. I sometimes thought of ordering for the prayer to be commenced, and I would appoint a man to lead the people in prayer, and then I would go, along with some men having bundles of firewood, to the people who are not attending the prayer and burn their houses with fire upon them."
Mu‘āwiyah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) said: "The Muezzins will have the longest necks of all the people on the Day of Judgment."
Abu Sa‘īd al-Khudri (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: “When you hear the Muezzin, repeat what he says.”
Jābir (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Whoever says on hearing the call to prayer: 'O Allah, Lord of this perfect call and the prayer that is to be offered, grant Muhammad the Wasīlah (the highest position of Paradise) and the Fadīlah (the degree of superiority), and resurrect him to the praiseworthy station that You have promised him,' He will definitely be granted my intercession on the Day of Judgment.”
Sa‘d ibn Abi Waqqās (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: “Whoever says when he hears the Muezzin: ‘I bear witness that there is no god but Allah, alone without any partner, and that Muhammad is His slave and Messenger. I am pleased with Allah as a Lord, with Muhammad as a Messenger, and with Islam as a religion,’ his sins shall be forgiven.”
