Sahih Muslim 3390
صحيح مسلم#3390SahihIbn Umar (Allah be pleased with them) reported that Allah's Messenger (ﷺ) came to the mosque at Quba' riding and on foot, and he observed two rak'ahs of (Nafl prayer) in it
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: 15:594