It was narrated that Abu Hurairah (RA) said: “I heard the Messenger of Allah (peace be upon him) himself say: ‘The Mu’adh-dhin’s sins will be forgiven as far as his voice reaches, and every wet and dry thing will pray for forgiveness for him. For the one who attends the prayer, twenty-five Hasanat (good deeds) will be recorded, and it is will be expiation (for sins committed) between them (the two prayers).'”
Sunan Ibn Majah, Vol. 1, Book 3, Hadith 19