(42) باب فَضْلِ صَلاَةِ الجَمَاعَةِ وَبَيَانِ التَّشْدِيدِ فِي التَّخَلُّفِ عَنْهَا
Ibn Umar reported Allah's Messenger (ﷺ) assaying:
Prayer said in a congregation is twenty-seven degrees more excellent than prayer said by a single person.
Reference: Sahih Muslim 650 a
In-book reference: Book 5, Hadith 313
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1365