The Excellence of the Adhan and the Response to the Mu’adhdhin - Section 1 Mishkat al-Masabih 654
Arabic hadith text
عَنْ مُعَاوِيَةَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «الْمُؤَذِّنُونَ أَطْوَلُ النَّاسِ أعناقا يَوْم الْقِيَامَة» . رَوَاهُ مُسلم
Translation
Mu‘awiya said that he heard God's Messenger say, “The mu’adhdhins will have the longest necks on the day of resurrection.” Muslim transmitted it.