(30) باب فَضْلِ صَلاَةِ الْجَمَاعَةِ
Narrated `Abdullah bin `Umar:
Allah's Messenger (ﷺ) said, "The prayer in congregation is twenty seven times superior to the prayer offered by person alone."
Reference: Sahih al-Bukhari 645
In-book reference: Book 10, Hadith 42
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 618