One-fifth of Booty to the Cause of Allah (Khumus)
Bukhari :: Book 4 :: Volume 53 :: Hadith 362
Narrated Nafi from Ibn Umar:
Allah's Apostle sent a Sariya towards Najd, and Abdullah bin 'Umar was in the Sariya. They gained a great number of camels as war booty. The share of each one of them was twelve or eleven camels, and they were given an extra camel each.
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