Narrated Anas bin Malik:

Allah's Apostle ﷺ offered the Fajr prayer when it was still dark, then he rode and said, 'Allah Akbar! Khaibar is ruined. When we approach near to a nation, the most unfortunate is the morning of those who have been warned." The people came out into the streets saying, "Muhammad and his army." Allah's Apostle vanquished them by force and their warriors were killed;
the children and women were taken as captives. Safiya was taken by Dihya Al-Kalbi and later she belonged to Allah's Apostle go who married her and her Mahr was her manumission.

حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، وَثَابِتٍ الْبُنَانِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى الصُّبْحَ بِغَلَسٍ ثُمَّ رَكِبَ فَقَالَ " اللَّهُ أَكْبَرُ خَرِبَتْ خَيْبَرُ، إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ ". فَخَرَجُوا يَسْعَوْنَ فِي السِّكَكِ وَيَقُولُونَ مُحَمَّدٌ وَالْخَمِيسُ ـ قَالَ وَالْخَمِيسُ الْجَيْشُ ـ فَظَهَرَ عَلَيْهِمْ رَسُولُ اللَّهِ ﷺ فَقَتَلَ الْمُقَاتِلَةَ وَسَبَى الذَّرَارِيَّ، فَصَارَتْ صَفِيَّةُ لِدِحْيَةَ الْكَلْبِيِّ، وَصَارَتْ لِرَسُولِ اللَّهِ ﷺ ثُمَّ تَزَوَّجَهَا وَجَعَلَ صَدَاقَهَا عِتْقَهَا. فَقَالَ عَبْدُ الْعَزِيزِ لِثَابِتٍ يَا أَبَا مُحَمَّدٍ، أَنْتَ سَأَلْتَ أَنَسًا مَا أَمْهَرَهَا قَالَ أَمْهَرَهَا نَفْسَهَا. فَتَبَسَّمَ.