(42) باب فَضْلِ صَلاَةِ الجَمَاعَةِ وَبَيَانِ التَّشْدِيدِ فِي التَّخَلُّفِ عَنْهَا
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Prayer said in a congregation is equivalent to twenty-five (prayers) as compared with the prayer said by a single person.
Reference: Sahih Muslim 649 d
In-book reference: Book 5, Hadith 311
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1363