Call to Prayers (Adhaan) 
Bukhari :: Book 1 :: Volume 11 :: Hadith 618
Narrated 'Abdullah bin Umar:
Allah's Apostle said, "The prayer in congregation is twenty seven times superior to the prayer offered by person alone."
Call to Prayers (Adhaan)
Bukhari :: Book 1 :: Volume 11 :: Hadith 618
Narrated 'Abdullah bin Umar:
Allah's Apostle said, "The prayer in congregation is twenty seven times superior to the prayer offered by person alone."