The Book of Jihad and Expedition (Kitab Al-Jihad wa'l-Siyar)

Muslim :: Book 19 : Hadith 4337

It has been narrated on the authority of Abdullah b. 'Umar that the Messenger of Allah (may peace be upon him) used to give (from the spoils of war) to small troops seat on expeditions something more than the due share of each fighter in a large force. And Khums (one-fifth of the total spoils) was to be reserved (for Allah and His Apostle) in all cases.