One-fifth of Booty to the Cause of Allah (Khumus)
Bukhari :: Book 4 :: Volume 53 :: Hadith 399
Narrated ' Abdullah bin 'Abbas:
That Abu Sufyan bin Harb Informed him that Heraclius called him and the members of a caravan from Quraish who had gone to Sham as traders, during the truce which Allah's Apostle had concluded with Abu Sufyan and the Quraish infidels.
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