Sunan Abu Dawood, Chapter: Prayer (Kitab Al-Salat)

The Prophet (peace_be_upon_him) 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.