An-Nasr bin Sufyan narrated that he heard Abu Hurairah say:
"We were with the Messenger of Allah (ﷺ) and Bilal stood up and gave the call. When he fell silent the Messenger of Allah (ﷺ) said: 'Whoever says the same as this (what the Mu'adhdhin) with certainty, he will enter Paradise. (FR)
English reference (FR): Vol. 1, Book 7, Hadith 675 (FR)
Arabic reference (FR): Book 7, Hadith 682 (FR)