Ibn Ibrahim bin al-Harith al-Taymi (may Allah have mercy on him) narrates from Isa bin Talhah (may Allah have mercy on him), who said: We went in to Sayyiduna Mu'awiyah (may Allah be pleased with him), and the caller called to prayer. He said: "Allahu Akbar, Allahu Akbar," and Mu'awiyah (may Allah be pleased with him) said the same. Then he said: "I bear witness that there is no god but Allah," and he said the same. Then he said: "I bear witness that Muhammad (peace and blessings be upon him) is the Messenger of Allah," and he said the same. Then he said: "This is how I heard the Messenger of Allah (peace and blessings be upon him) say it."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16786