Sahih al-Bukhari 4089
صحيح البخاري#4089SahihNarrated Anas:Allah's Messenger (ﷺ) said Al-Qunut for one month after the posture of Bowing, invoking evil upon some 'Arab tribes
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: 64:133