Hadith 383
Chapter 7: It Is Recommended For The One Who Hears The Mu'adhdhin To Repeat His Words, Then To Send Salat Upon The Prophet (saws) And Ask Allah To Grant Him Al-Wasilah - كتاب الصلاة
حَدَّثَنِي يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا سَمِعْتُمُ النِّدَاءَ فَقُولُوا مِثْلَ مَا يَقُولُ الْمُؤَذِّنُ " .
Abu Sa'id al-Khudri reported:
When you hear the call (to prayer), repeat what the Mu'adhdhin pronounces.
Reference : Sahih Muslim 383
In-book reference : Book 4, Hadith 12
USC-MSA web (English) reference : Book 4, Hadith 746