Sahih Muslim 1734
صحيح مسلم#1734SahihA'isha reported:The Messenger of Allah (ﷺ) used to pray in the night and when he observed Witr, he said to me: O 'A'isha, get up and observe Witr
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: 6:163