Sahih al-Bukhari 581
صحيح البخاري#581SahihNarrated `Umar:"The Prophet (ﷺ) forbade praying after the Fajr prayer till the sun rises and after the `Asr prayer till the sun sets." Narrated Ibn `Abbas: Some people told me the same narration (as above)
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: 9:57