The Book of Prayers (Kitab Al-Salat) 
Muslim :: Book 4 : Hadith 1366
Ibn 'Umar reported Allah's Apostle (may peace be upon him) as saying: The prayer of a person in congregation is twenty-seven times in excess to the prayer said alone.
The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1366
Ibn 'Umar reported Allah's Apostle (may peace be upon him) as saying: The prayer of a person in congregation is twenty-seven times in excess to the prayer said alone.