Sahih Muslim 1688
صحيح مسلم#1688SahihA'isha reported Allah's Messenger as saying:The two rak'ahs at dawn are better than this world and what it contains
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: 6:118