Jabir (may Allah be pleased with him) says: Abdullah bin Ubayy had two slave-girls, Musaykah and Umaymah, and Abdullah used to force them into fornication. The two of them complained of this to the Prophet (peace and blessings be upon him), and this verse was revealed: "And do not compel your slave-girls to prostitution" [Surah al-Nur: 33].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15790