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.'" (RU)
English reference (RU): Vol. 1, Book 7, Hadith 677 (RU)
Arabic reference (RU): Book 7, Hadith 684 (RU)