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