Sahih Bukhari Volume 004, Book 053, Hadith Number 362.

Narated By 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.