Sahih Muslim 1820
صحيح مسلم#1820SahihIbn 'Umar reported Allah's Apostle (ﷺ) as saying:Observe some of your prayers in your houses and do not make them graves
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: 6:248