Anas said that God’s messenger performed the 'umra four times, each of them Dhul Qa'da except the one which was combined with his hajja, one from al-Hudaibiya in Dhul Qa'da, one in the following year in Dhul Qa'da, one from al-Ji'rana where he divided the spoils of Hunain (The battle in which the Prophet defeated Hawazin after the conquest of Mecca in 8 A.H) in Dhul Qa'da, and one along with his hajja. Bukhari and Muslim.
Hadith Referenceمشكوة المصابيح / كتاب المناسك / 2518
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (4148) و مسلم (1253/217)»