Sahih al-Bukhari 674
صحيح البخاري#674SahihNarrated Ibn `Umar:The Prophet (ﷺ) said, "If anyone of you is having his meals, he should not hurry up till he is satisfied even if the prayer has been started
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: 10:68