Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 515
Narated By AbuHurayrah : The Prophet (pbuh) said: 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 (the congregation of) prayer will have twenty-five prayers recorded for him and will have expiation for sins committed between every two times of prayer.