Sahih Muslim 1803
صحيح مسلم#1803SahihAbu Jamra reported:I heard Ibn 'Abbas saying that the Messenger of Allah (ﷺ) observed thirteen rak'ahs at night
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: 6:231