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 : Book 10, Hadith 10 USC-MSA web (English) : Vol. 1, Book 11, Hadith 586 (deprecated)
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