عَنْ سَعْدِ بْنِ أَبي وقَّاصٍ رضِيَ اللّهُ عَنْهُ، عَنِ النَّبِيِّ صَلّى اللّهُ عَلَيْهِ وسَلَّمَ أَنَّهُ قَالَ: «مَنْ قَالَ حِينَ يسْمَعُ المُؤَذِّنَ: أَشْهَدُ أَنْ لا إِلٰهَ إِلّا اللّهُ وحْدَهُ لا شَرِيكَ لَهُ، وَأَنَّ مُحمَّدًا عَبْدُهُ وَرسُولُهُ، رَضِيتُ بِاللّهِ رَبًّا، وَبِمُحَمَّدٍ رَسُولًا، وَبِالإِسْلاَمِ دِينًا غُفِرَ لَهُ ذَنْبُهُ» رَوَاهُ مُسْلِمٌ.

Sad ibn Abi Waqqas (may Allah be pleased with him) reported from the Prophet (peace and blessings be upon him) that he said: "Whoever says when he hears the muezzin: 'I bear witness that there is no god but Allah alone, without partner, and that Muhammad is His servant and Messenger; I am content with Allah as Lord, with Muhammad as Messenger, and with Islam as religion,' his sin will be forgiven." Reported by Muslim.