Abu Saʿid Al-Khudri told my father, "I see you liking sheep and the wilderness. So whenever you are with your sheep or in the wilderness and you want to pronounce Adhan for the prayer raise your voice in doing so, for whoever hears the Adhan, whether a human being, a jinn or any other creature, will be a witness for you on the Day of Resurrection." Abu Saʿid added, "I heard it (this narration) from Messenger of Allah ﷺ." (Using translation from Bukhārī 609)  

لَهُ «إِنِّي أَرَاكَ تُحِبُ الْغَنَمِ وَالْبَادِيَةِ فَإِذَا كُنْتَ فِي غَنَمِكَ أَوْ بَادِيَتِكَ فَأَذَّنْتَ بِالصَّلَاةِ فَارْفَعْ صَوْتَكَ فَإِنَّهُ لَا يَسْمَعُ مَدَى صَوْتِ الْمُؤَذِّنَ جِنٌّ وَلَا إِنْسٌ وَلَا شَيْءٌ إِلَّا شَهِدَ لَهُ يَوْمَ الْقِيَامَةِ» قَالَ أَبُو سَعِيدٍ سَمِعَتْهُ مِنْ رَسُولِ اللهِ ﷺ  

"The Mu'adhdhin will be forgiven as far as his voice reaches, and every wet and dry thing will bear witness for him." (Using translation from Nasāʾī 645)  

عَنْ أَبِي هُرَيْرَةَ سَمِعَهُ مِنْ فَمِ النَّبِيِّ ﷺ يَقُولُ «الْمُؤَذِّنُ يُغْفَرُ لَهُ مُدَّ صَوْتِهِ وَيَشْهُدُ لَهُ كُلُّ رَطْبٍ وَيَابِسٍ»  

"Allah and His angels say salah upon the front rows, and the Mu'adhdhin will be forgiven as far as his voice reaches, and whatever hears him, wet or dry, will confirm what he says, and he will have a reward like that of those who pray with him." (Using translation from Nasāʾī 646)  

«إِنَّ اللهَ وَمَلَائِكَتَهُ يُصَلُّونَ عَلَى الصَّفِّ الْمُقَدَّمِ وَالْمُؤَذِّنُ يُغْفَرُ لَهُ مُدَّ صَوْتِهِ وَيُصَدِّقُهُ مَنْ سَمِعَهُ مِنْ رَطْبٍ وَيَابِسٍ وَلَهُ مِثْلُ أَجْرِ مَنْ صَلَّى مَعَهُ»