Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 690
Narrated 'Aisha:
We set out with Allah's Apostle, and some of us assumed the lhram for 'Umra, some assumed it for Hajj, and some assumed it for both Hajj and 'Umra. Allah's Apostle assumed the Ihram for Hajj. So those who had assumed the Ihram for Hajj or for both Hajj and 'Umra, did not finish their Ihram till the day of An-Nahr (i.e. slaughter of sacrifices).