Sahih al-Bukhari 1384
صحيح البخاري#1384SahihNarrated Abu Huraira:The Prophet (ﷺ) was asked about the offspring of pagans (Mushrikeen); so he said, "Allah knows what sort of deeds they would have done
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: 23:136