Majma al-Zawaid 1882 — Responding to the muezzin, and what to say

Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) relates that the Prophet (peace and blessings be upon him) said: "Any Muslim who, while hearing the adhan, says the takbir when the mu'adhdhin says the takbir, and when he bears witness that there is no god besides Allah Almighty and bears witness that Sayyiduna Muhammad (peace and blessings be upon him) is the Messenger of Allah (the listener also recites these same words), and then makes this supplication: 'O Allah, grant Sayyiduna Muhammad (peace and blessings be upon him) al-Wasilah and al-Fadilah (excellence), place his rank among the most exalted (al-a'lin), place love for him among the chosen servants, and place his remembrance among those brought near,' (the Prophet (peace and blessings be upon him) said:) intercession will become due for that person on the Day of Resurrection."
Imam al-Tabarani recorded this narration in al-Mu'jam al-Kabir, and its narrators have been declared trustworthy.