Sahih Muslim Book 19, Hadith Number 4330.

Chapter : Spoils of war.

It has been narrated on the authority of Ibn Umar that the Prophet (may peace be upon him) sent an expedition to Najd and I was among the troops. They got a large number of camels as a booty. Eleven or twelve camels fell to the lot of every fighter and each of them also got one extra camel.