Sahih al-Bukhari 3968
صحيح البخاري#3968SahihNarrated Qais bin Ubad:I heard Abu Dhar swearing that these Holy Verses were revealed in connection with those six persons on the day of Badr
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: 64:21