حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عُمَرَ بْنِ مُحَمَّدٍ، عَنْ أَبَانَ بْنِ صَالِحٍ الْقُرَشِيِّ، حَدَّثَنَا عَمْرُو بْنُ مُحَمَّدٍ، - يَعْنِي الْعَنْقَزِيَّ - عَنْ عَبْدِ اللَّهِ بْنِ بُدَيْلٍ، بِإِسْنَادِهِ نَحْوَهُ قَالَ فَبَيْنَمَا هُوَ مُعْتَكِفٌ إِذْ كَبَّرَ النَّاسُ فَقَالَ مَا هَذَا يَا عَبْدَ اللَّهِ قَالَ سَبْىُ هَوَازِنَ أَعْتَقَهُمُ النَّبِيُّ صلى الله عليه وسلم قَالَ وَتِلْكَ الْجَارِيَةُ ‏.‏ فَأَرْسَلَهَا مَعَهُمْ ‏.‏

Narrated Abdullah ibn Umar: The tradition mentioned above (No. 2468) has also been transmitted by Abdullah ibn Budayl through a different chain of narrators in a similar way. This version adds: While he (Umar) was observing i'tikaf (in the sacred mosque), the people uttered (loudly): "Allah is most great." He said: What is this, Abdullah? He said: These are the captives of the Hawazin whom the Messenger of Allah (PBUH) has set free. He said: This slave-girl too? He sent her along with them. Translation Not Available

Book Ref: Sunan Abi Dawud Book 14 Hadith 2475
Web Ref:  Sunan Abi Dawud Book 13 Hadith 2469