Sayyiduna Anas (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) performed four Umrahs, all of them in Dhu al-Qa'dah, except the one he performed with his Hajj: one Umrah from al-Hudaybiyah, or in the year of al-Hudaybiyah; the second in the following year in Dhu al-Qa'dah; the third from al-Ji'ranah, where he distributed the spoils of Hunayn; and one Umrah with his Hajj.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8738