Hadith 837
Chapter 42: Virtue of (prayer in) congregation - كتاب الإمامة
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " صَلاَةُ الْجَمَاعَةِ تَفْضُلُ عَلَى صَلاَةِ الْفَذِّ بِسَبْعٍ وَعِشْرِينَ دَرَجَةً " .
It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ) said:
"Praying in congregation is twenty-seven times better than praying alone."
Reference : Sunan an-Nasa'i 837
In-book reference : Book 10, Hadith 61