Sahih Muslim 3374
صحيح مسلم#3374SahihAbu Huraira (Allah be pleased with him) narrated It directly from Allah's Apostle' (ﷺ) having said this:A prayer in my mosque is a thousand times more excellent than a prayer in any other mosque, except Masjid al-Haram (Mosque of the Ka'ba)
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: 15:578