Sahih Muslim 1936
صحيح مسلم#1936SahihA'isha reported:Two are the prayers which the Messenger of Allah (ﷺ) always observed in my house-openly or secretly-two rak'ahs before the dawn and two rak'ahs after the 'Asr
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: 6:364