Sahih Muslim 1689
صحيح مسلم#1689SahihA'isha reported that the Messenger of Allah (ﷺ) said about the two (supererogatory) rak'ahs of the dawn:They are dearer to me than the whole world
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: 6:119