Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2800
Jabir b. 'Abdullah (Allah be pleased with them) reported: We set out with Allah's Messenger (may peace be upon him) as Muhrim for Hajj. The Messenger of Allah (may peace be upon him) commanded us to make this Ihram for Umra, and some put it off (af ter performing 'Umra), but the Prophet (may peace be upon him) had sacrificial animals with him, so he could not make it (this Ihram) as that of Umra.