عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْإِمَامُ ضَامِنٌ وَالْمُؤَذِّنُ مؤتمن الله أَرْشِدِ الْأَئِمَّةَ وَاغْفِرْ لِلْمُؤَذِّنِينَ» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُدَ وَالتِّرْمِذِيُّ وَالشَّافِعِيُّ وَفِي أُخْرَى لَهُ بِلَفْظِ المصابيح
Translation

‘Abdallah b. ‘Amr told of a man who said, “Messenger of God, the mu'adhdhins excel us.”* To him God’s Messenger replied, ‘Say the same words as they say, and when you come to the end, if you make any petition it will be granted to you.” * This most probably means that they get a greater reward. The reply suggests how that may be counterbalanced.Abu Dawud transmitted it.