(7) باب مَا يَقُولُ إِذَا سَمِعَ الْمُنَادِي
Narrated `Isa bin Talha:
that he had heard Muawiya repeating the words of Adhan up to "Wa ash-hadu anna Muhammadan rasulul-lah (and I testify that Muhammad is Allah's Messenger (ﷺ).)"
Reference: Sahih al-Bukhari 612
In-book reference: Book 10, Hadith 10
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 586