Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.122.
Section : Umrahs Performed By the Prophet.
Ibn ‘Abbas reported that the Prophet (peace be upon him) performed four ‘Umrahs in his lifetime: ‘Umrah of Hudaibiyah, one that he performed to make up for another missed ‘Umrah, a third that he performed going forth from Al-Ji’rannah, and the fourth he combined with his Hajj. This was reported by Ahmad, Abu Daw’ud and Ibn Majah, with a sound chain of authorities.