Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 523
Narrated Anas bin Malik:
The Prophet stayed with Safiya bint Huyai for three days on the way of Khaibar where he consummated his marriage with her. Safiya was amongst those who were ordered to use a veil.