Sahih al-Bukhari 5456
صحيح البخاري#5456SahihNarrated Ibn `Abbas:The Prophet (ﷺ) said, 'When you eat, do not wipe your hands till you have licked it, or had it licked by somebody else
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 70:85