From Sahih Bukhari (Hadith 3138):
Narrated 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
Reference: Bukhari 3138