Sahih Muslim 1678
صحيح مسلم#1678SahihHafsa reported that when it was dawn, the Messenger of Allah (ﷺ) did not observe (any other prayers) but two short rak'ahs
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: 6:108