عَنْ مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَتَشَهَّدُ مَعَ الْمُؤَذِّنِينَ
It is narrated from Sayyiduna Muawiyah bin Abi Sufyan (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to repeat the testimony phrases along with the muezzins.