Sahih Muslim 1753
صحيح مسلم#1753SahihIbn 'Umar reported the Messenger of Allah (ﷺ) as say- ing:Hasten to pray Witr before morning
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: 6:182