Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 681
Narrated Hafsa:
(the wife of the Prophet) The Prophet ordered all his wives to finish their Ihram during the year of Hajjat-ul-Wada. On that, I asked the Prophet "What stops you from finishing your lhram?" He said, "I have matted my hair and garlanded my Hadi. So I will not finish my Ihram unless I have slaughtered my Hadi."