Sayyiduna Ibn Mughaffal (may Allah be pleased with him) said that captives arrived from Khawlan, and Sayyidah Aishah (may Allah be pleased with her) owed the freeing of a slave from the descendants of Isma'il (peace be upon him). Captives came from Yemen, and Sayyidah Aishah (may Allah be pleased with her) intended to free one, but the Prophet (peace and blessings be upon him) forbade her. Then captives came from the tribe of Mudar, I think he said: from Banu al-Anbar, and the Prophet (peace and blessings be upon him) ordered her to free one of them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18076