Sahih al-Bukhari 3174
صحيح البخاري#3174SahihNarrated ' `Abdullah bin `Abbas:That Abu Sufyan bin Harb Informed him that Heraclius called him and the members of a caravan from Quraish who had gone to Sham as traders, during the truce which Allah's Messenger (ﷺ) had concluded with Abu Sufyan and the Quraish infidels
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: 58:16