What is the reward for raising one's voice in the adhan?
The Messenger of Allah, peace and blessings of Allah be upon him, said:
"If you are among your sheep or in the desert,
and you call the adhan for prayer,
then raise your voice with the call,
for no jinn, human, or anything else hears the extent of the mu'adhdhin's voice,
but it will bear witness for him on the Day of Resurrection."