"The Messenger of Allah said: 'When the Mu'adh-dhin calls the Adhan, say as he says.'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَذَّنَ الْمُؤَذِّنُ فَقُولُوا مِثْلَ قَوْلِهِ  

When the Messenger of Allah was with her on her day and night, and heard the Mu'adh-dhin calling the Adhan, she heard him saying what he said.  

أَنَّهَا سَمِعَتْ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا كَانَ عِنْدَهَا فِي يَوْمِهَا وَلَيْلَتِهَا فَسَمِعَ الْمُؤَذِّنَ يُؤَذِّنُ قَالَ كَمَا يَقُولُ الْمُؤَذِّنُ  

"The Messenger of Allah said: 'When you hear the call (to prayer), say what the Mu'adh-dhin says.'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا سَمِعْتُمُ النِّدَاءَ فَقُولُوا كَمَا يَقُولُ الْمُؤَذِّنُ  

The Messenger of Allah said: "Whoever says, when he hears the Mu'adh-dhin, 'Wa ana Ash-hadu an la ilaha illallah wahdahu la sharika lahu, wa ash-hadu anna Muhammadan 'abduhu wa rasuluhu, radaytu Billahi rabban wa bil-islami dinan wa bi muhammadin nabiyyan (And I bear witness that none has the right to be worshipped but Allah alone, with no partner, and I bear witness that Muhammad is His slave and Messenger, and I am content with Allah as my Lord, Islam as my religion and Muhammad as my Prophet),' his sins will be forgiven to him."  

عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ قَالَ مَنْ قَالَ حِينَ يَسْمَعُ الْمُؤَذِّنَ وَأَنَا أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ رَضِيتُ بِاللَّهِ رَبًّا وَبِالإِسْلاَمِ دِينًا وَبِمُحَمَّدٍ نَبِيًّا غُفِرَ لَهُ ذَنْبُهُ  

"The Messenger of Allah said: 'Whoever says when he hears the call to the prayer: "Allahumma Rabba hadhihid-da'watit-tammah was-salatil-qa'imah, ati Muhammadanil-wasilata wal-fadilah, wab'athhu maqaman mahmudanilladhi wa'adtah (O Allah, Lord of this perfect call and the prayer to be offered, grant Muhammad the privilege (of intercession) and also the eminence, and resurrect him to the praised position that You have promised)," my intercession for him will be permitted on the Day of Resurrection.'"  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَالَ حِينَ يَسْمَعُ النِّدَاءَ اللَّهُمَّ رَبَّ هَذِهِ الدَّعْوَةِ التَّامَّةِ وَالصَّلاَةِ الْقَائِمَةِ آتِ مُحَمَّدًا الْوَسِيلَةَ وَالْفَضِيلَةَ وَابْعَثْهُ مَقَامًا مَحْمُودًا الَّذِي وَعَدْتَهُ إِلاَّ حَلَّتْ لَهُ الشَّفَاعَةُ يَوْمَ الْقِيَامَةِ