The Prophet ﷺ said: The mu'adhdhin will receive forgiveness to the extent to which his voice reaches, and every moist and dry place will testify on his behalf; and he who attends (the congregation of) prayer will have twenty-five prayers recorded for him and will have expiation for sins committed between every two times of prayer.
عَنِ النَّبِيِّ ﷺ قَالَ الْمُؤَذِّنُ يُغْفَرُ لَهُ مَدَى صَوْتِهِ وَيَشْهَدُ لَهُ كُلُّ رَطْبٍ وَيَابِسٍ وَشَاهِدُ الصَّلاَةِ يُكْتَبُ لَهُ خَمْسٌ وَعِشْرُونَ صَلاَةً وَيُكَفَّرُ عَنْهُ مَا بَيْنَهُمَا