The Book of the Adhan (The Call to Prayer)
7/14. Chapter:
Raising The Voice With The Adhan
Sunan an-Nasai
أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، وَمُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالاَ حَدَّثَنَا يَزِيدُ، - يَعْنِي ابْنَ زُرَيْعٍ - قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ مُوسَى بْنِ أَبِي عُثْمَانَ، عَنْ أَبِي يَحْيَى، عَنْ أَبِي هُرَيْرَةَ، سَمِعَهُ مِنْ، فَمِ رَسُولِ اللَّهِ صلى الله عليه وسلم يَقُولُ " الْمُؤَذِّنُ يُغْفَرُ لَهُ بِمَدِّ صَوْتِهِ وَيَشْهَدُ لَهُ كُلُّ رَطْبٍ وَيَابِسٍ " .
It was narrated from Abu Hurairah, who heard it from the mouth of the Messenger of Allah (S.A.W): "The Mu'adhdhin will be forgiven as far as his voice reaches, and every wet and dry thing will bear witness for him."
Reference : Sunan an-Nasa'i 645In-book reference : Book 7, Hadith 20English translation : Vol. 1, Book 7, Hadith 646