Sahih al-Bukhari Book 10, Hadith 6
Allah's Messenger (ﷺ) said, "When the Adhan is pronounced Satan takes to his heels and passes wind with
noise during his flight in order not to hear the Adhan. When the Adhan is completed he comes back
and again takes to his heels when the Iqama is pronounced and after its completion he returns again
till he whispers into the heart of the person (to divert his attention from his prayer) and makes him
remember things which he does not recall to his mind before the prayer and that causes him to forget
how much he has prayed."
Anas said, "Bilal was ordered to pronounce the wording of Adhan twice and of Iqama once only." The sub narrator Isma`il said, "I mentioned that to Aiyub and he added (to that), "Except Iqama (i.e. Qadqamat- is-salat which should be said twice).
Abu Sa`id 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 Sa`id added, "I heard it (this narration) from Allah's Messenger (ﷺ)."