Al-Sha'bi (may Allah have mercy on him) narrates: Sayyidah Juwayriyah (may Allah be pleased with her) was owned by the Messenger of Allah (peace and blessings be upon him), so he (peace and blessings be upon him) freed her and made her freedom her dowry (mahr), and he freed every captive of Banu al-Mustaliq.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20525