Sunan Ibn Majah, Hadith 787 ⓘ
It was narrated from Abu Hurairah that: The Messenger of Allah said: "The prayer in congregation is twenty-five times more virtuous than the prayer of anyone of you on his own."
حَدَّثَنَا أَبُو مَرْوَانَ، مُحَمَّدُ بْنُ عُثْمَانَ الْعُثْمَانِيُّ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ " فَضْلُ الْجَمَاعَةِ عَلَى صَلاَةِ أَحَدِكُمْ وَحْدَهُ خَمْسٌ وَعِشْرُونَ جُزْءًا " .
also referenced under: Book 4, Hadith 53 (In-Book) & Volume 1, Book 4, Hadith 787 (DarusSalam)