‘Uthman b. Abul ‘As said that he asked God's Messenger to make him his people’s imam and that he replied, “You are their imam, but do according to what the weakest of them is capable of, and employ a mu’adhdhin who does not accept payment for his adhan.”
Abu Huraira reported God’s Messenger as saying, “The mu'adhdhin will receive forgiveness to the extent to which his voice reaches, and every moist and dry place will testify on his behalf; and he who attends prayer will have twenty-five prayers recorded for him and will have expiation for sins committed between every two times of prayer.”
Ahmad, Abu Dawud and Ibn Majah transmitted it, and Nasa’i transmitted up to “every moist and dry place will testify on his behalf,” adding “and he will have a reward equal to that of those who pray.”
God’s Messenger taught me to say when the adhan for the sunset prayer was called, “O God, this is the time when Thy night comes on, Thy day retires, and the voices of Thy summoners are heard, so forgive me.”
Abu Dawud transmitted it, as did Baihaqi in ad-Da'awat al-kabir.
Narrated Ibn ‘Umar reported God’s Messenger as saying, “Three will be on mounds of musk on the day of resurrection:
a man who gives God and his patron their due, a man who leads people in prayer to their satisfaction, and a man who summons people to the five times of prayer every day and night.”
Tirmidhi transmitted it and said that it is a gharib tradition.