Praying in congregation is twenty-seven degrees better than praying alone
Authentic hadithعن عبد الله بن عمر رضي الله عنهما أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ: «صلاةُ الجَمَاعَة أَفضَلُ من صَلاَة الفَذِّ بِسَبعٍ وعِشرِين دَرَجَة».
‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported that the Messenger (may Allah's peace and blessings be upon him) said: "Praying in congregation is twenty-seven degrees better than praying alone."
Explanation
This Hadīth shows the virtue of praying in congregation over praying alone, because praying in congregation - due to what it contains of great, immense benefit - is more virtuous and increases the reward by twenty-seven times more than praying alone. This is due to the great gap between the two in terms of achieving the target. Without a doubt, whoever misses out on this great profit is deprived.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).