One-fifth of Booty to the Cause of Allah (Khumus)

Narrated `Abdullah bin Mughaffal: While we were besieging the fort of Khaibar, a person threw a leather container containing fat, and I ran to take it, but when I turned I saw the Prophet (standing behind), so I felt embarrassed in front of him.

Narrated Ibn `Umar: In our holy battles, we used to get honey and grapes, as war booty which we would eat and would not store.

Narrated Ibn Abi `Aufa: We were afflicted with hunger during the besiege of Khaibar, and when it was the day of (the battle of) Khaibar, we slaughtered the donkeys and when the pots got boiling (with their meat). Allah's Apostle made an announcement that all the pots should be upset and that nobody should eat anything of the meat of the donkeys. We thought that the Prophet prohibited that because the Khumus had not been taken out of the booty (i.e. donkeys); other people said, "He prohibited eating them for ever." The sub-narrator added, "I asked Sa`id bin Jubair who said, 'He has made the eating of donkeys' meat illegal for ever.")