Sahih Bukhari Volume 003, Book 027, Hadith Number 008.

Narated By Hammam : The Prophet performed four 'Umra (three) in Dhi-l-Qa'da except the (one) 'Umra which he performed with his Hajj: His 'Umra from Al-hudaibiya, and the one of the following year, and the one from Al-Jr'rana where he distributed the booty (of the battle) of Hunain, and another 'Umra with his Hajj.