Sahih al-Bukhari 7376
صحيح البخاري#7376SahihNarrated Jarir bin `Abdullah:Allah's Messenger (ﷺ) said, "Allah will not be merciful to those who are not merciful to mankind
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: 97:6