(16) باب فَضْلِ الصَّلاَةِ فِي جَمَاعَةٍ
It was narrated that Ibn 'Umar said:
"The Messenger of Allah said: 'The prayer of a man in congregation is twenty-seven levels more virtuous than a man's prayer on his own.'"
Reference: Sunan Ibn Majah 789
In-book reference: Book 4, Hadith 55
English translation: Vol. 1, Book 4, Hadith 789