Alqamah bin Waqas (may Allah have mercy on him) says that once I was with Hazrat Muawiyah (may Allah be pleased with him) when the muezzin began to give the adhan. Hazrat Muawiyah (may Allah be pleased with him) also began to repeat the same words. When he said "Hayya 'ala-s-Salah," he replied, "La hawla wa la quwwata illa billah." In response to "Hayya 'ala-l-Falah," he said the same. After that, he continued to repeat the words of the muezzin. Then he said, "I heard the Prophet (peace and blessings be upon him) saying the same."