Yahya related to me from Malik from Abd arRahman ibn Abdullah ibn
Abd ar-Rahman ibn Abu Sasaca al-Ansari, and later al-Mazini, that his
father told him that Abu Said al-Khudri had said to him, "I see that
you love sheep and the desert. When you are among your sheep or in
your desert, call the prayer and raise your voice in the adhan,
because I heard the Messenger of Allah, may Allah bless him and grant
him peace, say, 'No jinn or man or anything within range hears the
voice of the muadhdhin except that it bears witness for him on the day
of rising.' "
App reference: Book 3, Hadith 5
USC-MSA web (English) reference: Book 3, Hadith 5
Arabic reference: Book 3, Hadith 151