Sunan Abi Dawud Book 2, Hadith 135

If anyone says when he hears the MU’ADHDHIN : “And I testify that there is no god but Allah alone who has no partner and that Muhammad is His servant and Apostle: I am satisfied with Allah as lord, with Muhammad as apostle and with Islam as religion”, he will be forgiven.

Previous Hadith

A man said: Messenger of Allah, the mu'adhdhins excel us. The Messenger of Allah (ﷺ) said: Say (the same words) as they say, and when you come to the end, make a petition and that will be granted to you.

Sunan Abi Dawud Book 2, Hadith 134
Next Hadith

“And I too, and I too”.

Sunan Abi Dawud Book 2, Hadith 136