عَنْ مُجَمِّعِ بْنِ يَحْيَى الْأَنْصَارِيِّ قَالَ: كُنْتُ إِلَى جَنْبِ أَبِي أُمَامَةَ بْنِ سَهْلٍ وَهُوَ مُسْتَقْبِلُ الْمُؤَذِّنِ وَكَبَّرَ الْمُؤَذِّنُ اثْنَتَيْنِ، فَكَبَّرَ أَبُو أُمَامَةَ اثْنَتَيْنِ، وَشَهِدَ أَنْ لَا إِلَهَ إِلَّا اللَّهُ إِثْنَتَيْنِ، فَشَهِدَ أَبُو أُمَامَةَ اثْنَتَيْنِ، وَشَهِدَ الْمُؤَذِّنُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ إِثْنَتَيْنِ، وَشَهِدَ أَبُو أُمَامَةَ اثْنَتَيْنِ، ثُمَّ الْتَفَتَ إِلَيَّ فَقَالَ: هَٰكَذَا حَدَّثَنِي مُعَاوِيَةُ بْنُ أَبِي سُفْيَانَ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ
Majma’ bin Yahya Ansari says: I was with Sayyiduna Abu Umamah bin Sahl (may Allah be pleased with him) and he was facing the muezzin. The muezzin said “Allahu Akbar” twice, and in response, Sayyiduna Abu Umamah (may Allah be pleased with him) also said “Allahu Akbar” twice. The muezzin said “Ashhadu an la ilaha illallah” twice, and Sayyiduna Abu Umamah (may Allah be pleased with him) also said “Ashhadu an la ilaha illallah” twice. Then the muezzin said “Ashhadu anna Muhammadan Rasulullah” twice, so Sayyiduna Abu Umamah also said “Ashhadu anna Muhammadan Rasulullah” twice. Then he turned to me and said: Sayyiduna Muawiyah bin Abi Sufyan (may Allah be pleased with him) narrated to me from the Messenger of Allah (peace and blessings be upon him) in this same manner.