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The Muhammadan religion appears to give almost unlimited license to concubinage, provided the woman be a slave and not a free Muslim woman. Those female slaves must be either (1) taken captive in war, (2) or purchased by money, (3) or the descendants of slaves. Even married women, if taken in war, are, according to the injunction of the Qur'an, Surah iv. 28, entirely at the disposal of the Muslim conqueror. "(Unlawful) to you are married women except such as your right hand possess (i.e. taken in war or purchased as slave)." This institution of concubinage is founded upon the example of Muhammad himself, who took Rihanah the Jewess as his concubine after the battle with the Bani Quraizah (A.H. 5), and also Maria the Copt, who was sent him as a slave by the Governor of Egypt.
— THOMAS HUGHES (PRIEST)