The imam is responsible and the mu'adhdhin is trusted, O Allah, guide the imams and forgive the mu'adhdhins.  

قَالَ رَسُولُ اللَّهِ ﷺ الإِمَامُ ضَامِنٌ وَالْمُؤَذِّنُ مُؤْتَمَنٌ اللَّهُمَّ أَرْشِدِ الأَئِمَّةَ وَاغْفِرْ لِلْمُؤَذِّنِينَ  

This tradition has also been transmitted through a different chain of narrators by Abu Hurairah who reported it in a similar manner from the Messenger of Allah ﷺ.  

وَلاَ أُرَانِي إِلاَّ قَدْ سَمِعْتُهُ مِنْهُ عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ مِثْلَهُ