The Messenger of Allah ﷺ said, "The reward of praying in congregation exceeds that of praying alone by twenty-five degrees."
حدثنا يزيد أخبرنا محمد عن أبي سلمة
قال رسول الله ﷺ فضل صلاة الجماعة على صلاة الفذ خمسا وعشرين درجة
Its isnad is sahih. It appeared previously at 10109.