Sahih Muslim 1476
صحيح مسلم#1476SahihAbu Huraira reported:The Messenger of Allah (way peace be upon him) said: Prayer along with the Imam is twenty-five times more excellent than prayer said by a single person
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:309