One-fifth of Booty to the Cause of Allah (Khumus)
Bukhari :: Book 4 :: Volume 53 :: Hadith 366
Narrated Jabir bin Abdullah:
While Allah's Apostle 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."
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