Sahih Muslim Book 7, Hadith Number 2881.

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

Abu Ishaq said: I asked Zaid b. Arqam: In how many military expeditions have you participated with Allah’s Messenger (may peace be upon him)? He said: In seventeen (expeditions). He (Abu Ishaq) said: Zaid b. Arqam reported to me that Allah’s Messenger (may peace be upon him) had led nineteen expeditions. And he performed Hajj only once after Migration, and that was the Farewell Pilgrimage. Abu Ishaq also said: The second (Hajj) he performed at Mecca (before his Migration to Medina)