Sayyiduna Ali (may Allah be pleased with him) and Sayyiduna Ibn Mas'ud (may Allah be pleased with him) spoke concerning the saying of Allah Almighty: "And (forbidden to you are) married women, except those whom your right hands possess" [Surah al-Nisa: 24]. Sayyiduna Ali (may Allah be pleased with him) said: "Idolatrous women, when they are taken captive, become lawful." And Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: "This ruling applies to married women of both kinds, idolatrous and Muslim."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9004