Sahih Muslim 593
صحيح مسلم#593SahihHuddaifa reported:Whenever the Messenger of Allah (ﷺ) got up for Tahajjud prayer, he cleansed his mouth with the tooth-stick
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: 2:60