"The Messenger of Allah performed four Umrah: The Umrah of Al-Hudaibiyah, a second Umrah the following (year), (which was) the Umrah of Al-Qisas during Dhul-Qa'dah, a third Umrah from Al-Ji'irranah, and the fourth which accompanied his Hajj."
Jami` at-Tirmidhi Book 9, Hadith 9