أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ صَلاَةُ الْجَمَاعَةِ أَفْضَلُ مِنْ صَلاَةِ أَحَدِكُمْ وَحْدَهُ خَمْسًا وَعِشْرِينَ جُزْءًا ‏"‏ ‏.‏

It was narrated from Abu Hurairah that the Messenger of Allah (PBUH) said: "Praying in congregation is twenty-five portions better than one of you praying alone." Translation Not Available

Book Ref: Sunan An Nisai Book 10 Hadith 838
Web Ref:  Sunan An Nisai Vol 1 Book 10 Hadith 839