The Prophet ﷺ said: “When the Mu’adhdhin says: ‘Hayya ‘ala as-Salah’ and ‘Hayya ‘ala al-Falah,’ say: ‘La hawla wa la quwwata illa billah.’ Whoever says it sincerely from the heart will enter Paradise.”
On the authority of Sa'd ibn Abi Waqqas (may Allah be pleased with him), the Prophet ﷺ said: "Whoever says when he hears the Mu’adhdhin: ‘I bear witness that there is no deity worthy of worship but Allah alone with no partner, and that Muhammad is His servant and Messenger. I am pleased with Allah as my Lord, with Muhammad as a Messenger, and with Islam as a religion,’ his sins will be forgiven."
Narrated Abdullah ibn Amr ibn Al-As (may Allah be pleased with them): I heard the Messenger of Allah (peace be upon him) say: “When you hear the call to prayer, say what the caller says, then send blessings upon me, for whoever sends blessings upon me once, Allah will send blessings upon him tenfold. Then ask Allah for Al-Waseelah, for it is a rank in Paradise that none but a servant of Allah may attain, and I hope that I am that servant. Whoever asks for Al-Waseelah for me, my intercession will be guaranteed for him.”
Narrated Jabir ibn Abdullah (may Allah be pleased with them): The Messenger of Allah (peace be upon him) said: "Whoever says when he hears the call to prayer: 'O Allah, Lord of this perfect call and established prayer, grant Muhammad the intercession and favor, and raise him to the praised position You promised him,' my intercession will be permitted for him on the Day of Resurrection."
O Allah, send prayers, peace, and blessings upon our Master Muhammad. O Lord of this perfect call and established prayer, grant Muhammad the means and virtue, and raise him to the praised station You promised him. Indeed, You do not break Your promise.
Between the Adhan and the Iqama, supplication is encouraged and recommended. The Prophet Muhammad (peace be upon him) said: "Supplication is not rejected between the Adhan and the Iqama." He also said: "Indeed, supplication is not rejected between the Adhan and the Iqama, so pray."
اللهُ أكْبَرُ ، اللهُ أكْبَرُ اللهُ أكْبَرُ ، اللهُ أكْبَرُ أشْهَدُ أنَّ لا إلَهَ إلاَّ اللهُ أشْهَدُ أنَّ لا إلَهَ إلاَّ اللهُ أشْهَدُ أنَّ مُحَمَّداً رَسُولُ اللهِ أشْهَدُ أنَّ مُحَمَّداً رَسُولُ اللهِ حَيَّ عَلَى الصَّلاةِ حَيَّ عَلَى الصَّلاةِ حَيَّ عَلَى الفَلاحِ حَيَّ عَلَى الفَلاحِ اللهُ أكْبَرُ ، اللهُ أكْبَرُ لاَ إلَهَ إلاَّ اللهُ Narrated Anas ibn Mālik (may Allah be pleased with him): The Messenger of Allah (peace and blessings be upon him) taught me the Adhān, and he said: “Allāhu Akbar, Allāhu Akbar…” (Source: Ṣaḥīḥ Muslim, Book of Prayer, Chapter: The Description of the Adhān) Narrated Jābir ibn ʿAbdullāh (may Allah be pleased with him): The Messenger of Allah (peace and blessings be upon him) said: “Whoever hears the call to prayer should repeat what the muezzin says.” (Source: Ṣaḥīḥ al-Bukhārī, Hadith No. 611)
اللهُ أكْبَرُ ، اللهُ أكْبَرُ اللهُ أكْبَرُ ، اللهُ أكْبَرُ أشْهَدُ أنَّ لا إلَهَ إلاَّ اللهُ أشْهَدُ أنَّ لا إلَهَ إلاَّ اللهُ أشْهَدُ أنَّ مُحَمَّداً رَسُولُ اللهِ أشْهَدُ أنَّ مُحَمَّداً رَسُولُ اللهِ حَيَّ عَلَى الصَّلاةِ حَيَّ عَلَى الصَّلاةِ حَيَّ عَلَى الفَلاحِ حَيَّ عَلَى الفَلاحِ الصلاةُ خيرٌ مِنَ النوم الصلاةُ خيرٌ مِنَ النوم اللهُ أكْبَرُ ، اللهُ أكْبَرُ لاَ إلَهَ إلاَّ اللهُ Narrated ʿAbdullāh ibn Masʿūd (may Allah be pleased with him): The Prophet ﷺ said: "Bilāl calls the Adhan at night, so eat and drink until Ibn Umm Maktūm calls the Adhan." (Reported by Bukhari 617 and Muslim 1092)
اللهُ أكْبَرُ ، اللهُ أكْبَرُ أشْهَدُ أنَّ لا إلَهَ إلاَّ اللهُ أشْهَدُ أنَّ مُحَمَّداً رَسُولُ اللهِ حَيَّ عَلَى الصَّلاةِ حَيَّ عَلَى الفَلاحِ قَدْ قَامَتِ الصَّلَاةُ قَدْ قَامَتِ الصَّلَاةُ اللهُ أكْبَرُ ، اللهُ أكْبَرُ لاَ إلَهَ إلاَّ اللهُ Narrated ʿAbdullāh ibn Zayd (may Allah be pleased with him): He came to the Prophet ﷺ with a dream about the Adhan and Iqamah. The Prophet ﷺ said: “It is a true dream in shā’ Allah. Go and teach it to Bilāl, and let him say it.” In other narrations: Narrated ‘Abdullah ibn Zaid (may Allah be pleased with him): When the Prophet ﷺ intended to establish the call for the Iqama, ‘Abdullah ibn Zaid saw in a dream an angel teaching him the wording of the Iqama. He informed the Prophet ﷺ about it, who said: “Indeed, it is a true vision, if Allah wills. Go to Bilal and convey it to him, and let him call with it, for his voice is sweeter than yours.” Then the Prophet ﷺ ordered Bilal to call the Adhan with that wording. (Source: Sunan Abu Dawood 499, Sunan an-Nasa’i 632, authenticated by Al-Albani)