Sahih Bukhari Volume 005, Book 059, Hadith Number 512.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 59. Military Expeditions Led by the Prophet (PBUH) (Al-Maghaazi)
Narrated By Anas : The Prophet offered the Fajr Prayer near Khaibar when it was still dark and then said, "Allahu-Akbar! Khaibar is destroyed, for whenever we approach a (hostile) nation (to fight), then evil will be the morning for those who have been warned." Then the inhabitants of Khaibar came out running on the roads. The Prophet had their warriors killed, their offspring and woman taken as captives. Safiya was amongst the captives, She first came in the share of Dahya Alkali but later on she belonged to the Prophet. The Prophet made her manumission as her 'Mahr'.