Sahih al-Bukhari 3138
صحيح البخاري#3138SahihNarrated Jabir bin `Abdullah:While Allah's Messenger (ﷺ) was distributing the booty at Al-Ji'rana, somebody said to him "Be just (in your distribution)." The Prophet (ﷺ) replied, "Verily I would be miserable if I did not act justly
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: 57:46