Repeating after the Mu'adhin

1- Abu Sa'eed Al-Khudri (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Whenever you hear the Adhan, say what the mu'adh-dhin is saying."¹

2- Abdullah Ibn Amr Ibn Al-As (may Allah be pleased with them) reported: I heard the Messenger of Allah (peace and blessings be upon him) saying, "When you hear the Adhan, repeat what the mu'adhdhin says. Then ask Allah to exalt my mention because everyone who does so will receive in return ten rewards from Allah. Then beseech Allah to grant me al-Wasilah, which is a high rank in Jannah, fitting for only one of Allah's slaves; and I hope that I will be that man. If anyone asks al-Wasilah for me, it becomes incumbent upon me to intercede for him.''²

3- Omar Ibn Al-Khatab (may Allah be pleased with him) said the Messenger of Allah (peace and blessings be upon him) said: 'If the mu'adh-dhin (caller to prayer) says 'Allahu akbar Allahu akbar' then one of you says 'Allahu akbar Allahu akbar' then he says 'ash-hadu alla ilaha illa-Allah' so he says 'ash-hahdu alla ilaha illa-Allah' then he says 'ash-hadu anna Muhammadar rasool-Allah' so he says 'ash-hadhu anna Muhammadar-rasool-Allah' then he says 'hayiala-salaah' so he says 'la hawla wa la qawata illa billah' then he says 'hayi alalfalah' so he says 'la hawla wa la qawata illa bilah' then he says  'Allahu akbar, Allahu akbar' so he says 'Allahu akbar, Allahu akbar' then he says 'la ilaha illa Allah' so he says 'la ilaha illa Allah' from his heart (sincerely) he will enter Paradise.³

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([1]) Sahih Al-Bukhari – Kitab Al-Adhan (116), Sahih Muslim – Kitab Al-Salah (383).

([2]) Sahih Muslim – Kitab Al-Salah (483).

([3]) sahih muslim – kitab al-salah (583).