Sahih al-Bukhari 3766
صحيح البخاري#3766SahihNarrated Humran bin Aban:Muawiya said (to the people), "You offer a prayer which we, who were the companions of the Prophet (ﷺ) never saw the Prophet (ﷺ) offering, and he forbade its offering," i.e. the two rak`at after the compulsory `Asr prayer
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: 62:111