Sahih Muslim 5300
صحيح مسلم#5300SahihJabir reported that Allah's Messenger (ﷺ) commanded the licking of fingers and the dish, saying:You do not know in what portion the blessing lies
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: 36:174