Sahih al-Bukhari 3138
Sahih al-Bukhari · Book 57: One-fifth of Booty to the Cause of Allah (Khumus) · Khumus is to be used for the needs of the Muslims
Narrated Jabir bin `Abdullah:
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 " .
While Allah's Messenger (ﷺ) was distributing the booty at Al-Ja'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."