Messenger of Allah ﷺ said, "The prayer in congregation is twenty seven times superior to the prayer offered by person alone." (Using translation from Bukhārī 645)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «صَلَاةُ الْجَمَاعَةِ تَفْضُلُ عَلَى صَلَاةِ الْفَذِّ بِسَبْعٍ وَعِشْرِينَ دَرَجَةً»  

Prayer said in a congregation is twenty-five degrees more excellent than prayer said by a single person. (Using translation from Muslim 649a)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «صَلَاةُ الْجَمَاعَةِ أَفْضَلُ مِنْ صَلَاةِ أَحَدِكُمْ وَحْدَهُ خَمْسَةً وَعِشْرِينَ جُزْءًا»  

"Prayer in congregation is twenty-five levels better than a prayer offered on one's own." (Using translation from Nasāʾī 839)  

عَنِ النَّبِيِّ ﷺ قَالَ «صَلَاةُ الْجَمَاعَةِ تَزِيدُ عَلَى صَلَاةِ الْفَذِّ خَمْسًا وَعِشْرِينَ جُزْءًا»