بُلُوغُ الْمَرَامِ
Bulugh al-Maram 398
The Book of Prayer
عَنْ عَبْدِ اَللَّهِ بْنِ عُمَرَ -رَضِيَ اَللَّهُ عَنْهُمَا-; أَنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -قَالَ: { صَلَاةُ اَلْجَمَاعَةِ أَفْضَلُ مِنْ صَلَاةِ اَلْفَذِّ بِسَبْعٍ وَعِشْرِينَ دَرَجَةً } مُتَّفَقٌ عَلَيْهِ . [1] .
Narrated 'Abdullah bin 'Umar (RA): Allah's Messenger (ﷺ) said: "The prayer offered in congregation is twenty-seven degrees more rewardable than a prayer offered by a single person." [Agreed upon].
Sunnah.com reference: Book 2, Hadith 302