حَدَّثَنَا يُونُسُ بْنُ مُحَمَّدٍ حَدَّثَنَا لَيْثٌ عَنِ الْحُكَيْمِ بْنِ عَبْدِ اللَّهِ بْنِ قَيْسٍ عَنْ عَامِرِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ عَنْ أَبِيهِ سَعْدٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ مَنْ قَالَ حِينَ يَسْمَعُ الْمُؤَذِّنَ وَأَنَا أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ رَضِينَا بِاللَّهِ رَبًّا وَبِمُحَمَّدٍ رَسُولًا وَبِالْإِسْلَامِ دِينًا غُفِرَ لَهُ ذَنْبُهُ
مسند امام احمد بن حنبل · Hadith 1565
It was narrated from 'Amir bin Saad bin Abi Waqqas, from his father Saad, that the Messenger of Allah (PBUH) said: "Whoever says when he hears the mu'adhdhin : 'And I bear witness that there is no God but Allah alone, with no partner or associate, and that Muhammad is His slave and His Messenger; I am content with Allah as my Lord, Muhammad as my Messenger and Islam as my religion/ his sins will be forgiven him.
Sanad
حَدَّثَنَا يُونُسُ بْنُ مُحَمَّدٍ حَدَّثَنَا لَيْثٌ عَنِ الْحُكَيْمِ بْنِ عَبْدِ اللَّهِ بْنِ قَيْسٍ عَنْ عَامِرِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ عَنْ أَبِيهِ سَعْدٍ