VERILY, this Qur'an shows the way to all that is most uprightand gives the believers who do good deeds the glad tiding that theirs will be a great reward;
Al-Isra (The Journey by Night) Verse 9
The Prophet said, "The prayer in congregation is twenty five times superior to the prayer offered by person alone."
Sahih Bukhari: Volume 1, Book 11, Number 619