عَنْ أُمِّ حَبِيبَةَ رَضِيَ اللَّهُ عَنْهَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ كَانَ إِذَا سَمِعَ الْمُؤَذِّنَ يُؤَذِّنُ قَالَ كَمَا يَقُولُ حَتَّى يَسْكُتَ
It is narrated from Sayyida Umm Habibah (may Allah be pleased with her) that whenever the Noble Prophet (peace and blessings be upon him) heard the muezzin giving the call to prayer, he would repeat whatever the muezzin said until he became silent.