It was narrated that Abu Umamah bin Sahl said:
"I heard Mu'awiyah say: 'I heard the Messenger of Allah (ﷺ), when he heard the Mu'adhdhin, repeating what he said.'" (AR)
English reference (AR): Vol. 1, Book 7, Hadith 677 (AR)
Arabic reference (AR): Book 7, Hadith 684 (AR)