Sa'd bin Ibrahim narrates from his father that Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) divorced his wife and gave her a black slave-girl as provision (mut'ah). Abu Ubayd says: That is, giving provision after divorce; the Arabs called it "mut'at al-tahmim".
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14407