Sahih Muslim Book 7, Hadith Number 2879.

Chapter : Concerning the Umras performed by Allah’s Apostle (may peace be upon him) and their respective times.

Qatida said that Anas (Allah be pleased with him) had informed him that Allah’s Messenger (may peace be upon him) performed four ‘Umras, all during the month of Dhu’l-Qa’da except the one he performed along with Hajj (and these are) the Umra that he performed from al-Hudaibiya or during the time of (the truce of) Hudaibiya in the month of Dhu’l-Qa’da then the Umra of the next year in the month of Dhu’l-Qa’da, then the Umra for which he had started from ji’rana, the place where he distributed the spoils of (the battle of) Hunain in the month of Dhu’l-Qa’da, and then the ‘Umra that he performed along with his Hajj (on the occasion of the Farewell Pilgrimage).