Sahih Muslim 798
صحيح مسلم#798SahihIbn Abbas reported:The Apostle (ﷺ) took milk and then called for water and rinsed (his mouth) and said: It contains greasiness
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: 3:119