Sahih al-Bukhari, Hadith 3138 ⓘ
Narrated Jabir bin `Abdullah: While Allah's Messenger was distributing the booty at Al-Ja'rana, somebody said to him "Be just (in your distribution)." The Prophet replied, "Verily I would be miserable if I did not act justly."
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا قُرَّةُ، حَدَّثَنَا عَمْرُو بْنُ دِينَارٍ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ قَالَ بَيْنَمَا رَسُولُ اللَّهِ صلى الله عليه وسلم يَقْسِمُ غَنِيمَةً بِالْجِعْرَانَةِ إِذْ قَالَ لَهُ رَجُلٌ اعْدِلْ. فَقَالَ لَهُ " شَقِيتَ إِنْ لَمْ أَعْدِلْ " .
also referenced under: Book 57, Hadith 46 (In-Book) & Volume 4, Book 53, Hadith 366 (USC-MSA)