Qur’an 33:50—O Prophet! surely We have made lawful to you your wives whom you have given their dowries,
and those whom your right hand possesses out of those whom Allah has given to you as prisoners of war ...
Qur’an 23:1-6—The Believers must (eventually) win through—those who humble themselves in their prayers; who avoid vain talk; who are active in deeds of charity;
who abstain from sex, except with those joined to them in the marriage bond, or (the captives) whom their right hands possess—for (in their case) they are free from blame.
Qur’an 70:22-30—Not so those devoted to Prayer—those who remain steadfast to their prayer; and those in whose wealth is a recognized right for the (needy) who asks and him who is prevented (for some reason from asking); and those who hold to the truth of the Day Of Judgement; and those who fear the displeasure of their Lord—for their Lord’s displeasure is the opposite of Peace and Tranquility—
and those who guard their chastity, except with their wives and the (captives) whom their right hands possess—for (then) they are not to be blamed.
Sahih Muslim 3371—We went out with Allah’s Messenger on the expedition to the Bi’l-Mustaliq and took captive some excellent Arab women; and we desired them, for we were suffering from the absence of our wives, (but at the same time) we also desired ransom for them. So we decided to have sexual intercourse with them but by observing azl (withdrawing the male sexual organ before emission of semen to avoid conception). But we said: We are doing an act whereas Allah’s Messenger is amongst us; why not ask him? So we asked Allah’s Messenger, and he said: It does not matter if you do not do it, for every soul that is to be born up to the Day of Resurrection will be born.
Qur’an 4:24—Also (
prohibited are) women already married, except those whom your right hands possess ...
Here's the historical background for this verse:
Sunan Abu Dawud 2150—The Apostle of Allah sent a military expedition to Awtas on the occasion of the battle of Hunain. They met their enemy and fought with them. They defeated them and took them captives. Some of the Companions of the Apostle of Allah were reluctant to have intercourse with the female captives in the presence of their husbands who were unbelievers.
So Allah, the Exalted, sent down the Qur’anic verse: “And all married women (are forbidden) unto you save those (captives) whom your right hands possess.” That is to say, they are lawful for them when they complete their waiting period.
"... I told
the Muftis of Mecca that I had a question, since they were men who specialized in what was halal, and what was good, and who loved women. I said,
“What is the law of sex slaves?”
The mufti said, “With the law of sex slaves, there must be a Muslim nation at war with a nation which is not of the religion of the Kitab [Jews, Christians, Muslims], not of the religion of Islam. And there must be prisoners of war.”
“Is this forbidden by Islam?” I asked.
“Absolutely not. Sex slaves are not forbidden by Islam. On the contrary, sex slaves are under a different law than the free woman. The free woman must be completely covered except for her face and hands.
But the sex slave can be naked from the waist up. She differs a lot from the free woman. While the free woman requires a marriage contract,
the sex slave does not—she only needs to be purchased by her husband, and that’s it. Therefore the sex slave is different than the free woman.”
Kuwaiti Activist: "I Hope that Kuwait Will Enact a Law for...Sex Slaves"
Bukhari (62:137) - An account of women taken as slaves in battle by Muhammad's men after their husbands and fathers were killed. The woman were raped with Muhammad's approval.
Bukhari (34:432) - Another account of females taken captive and raped with Muhammad's approval. In this case it is evident that the Muslims intend on selling the women after raping them because they are concerned about devaluing their price by impregnating them. Muhammad is asked about coitus interruptus.
Ibn Ishaq (693) - "Then the apostle sent Sa-d b. Zayd al-Ansari, brother of Abdu'l-Ashal with some of the captive women of Banu Qurayza to Najd
and he sold them for horses and weapons." Muhammad trades away women captured from the Banu Qurayza tribe to non-Muslim slave traders for property. (Their men had been executed after surrendering without a fight).
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