Exodus 19:20-22 And whosoever lieth carnally with a woman, that is a bondmaid, betrothed to an husband, and not at all redeemed, nor freedom given her; she shall be scourged; they shall not be put to death, because she was not free. And he shall bring his trespass offering unto the LORD, unto the door of the tabernacle of the congregation, even a ram for a trespass offering. And the priest shall make an atonement for him with the ram of the trespass offering before the LORD for his sin which he hath done: and the sin which he hath done shall be forgiven him.
Deuteronomy 20:13-16 "And when the Lord thy God hath delivered [a city] into thine hands, thou shalt smite every male thereof with the edge of the sword: But the women, and the little ones . . . shalt thou take unto thyself . . . But of the cities of these people, which the Lord thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth" (KJV)
Deuteronomy 21:10-13 "When thou goest forth to war against thine enemies . . . And seest among the captives a beautiful woman, and hast a desire unto her, that thou wouldest have her to thy wife; Then thou shalt bring her home to thine house . . . thou shalt go in unto her, and be her husband, and she shall be thy wife" (KJV)
"And whoever among you cannot afford to marry free believing women, (let him marry) such of your believing maidens as your right hands possess. And Allah knows best your faith – you are (sprung) the one from the other. So marry them with the permission of their masters, and give them their dowries justly, they being chaste, not fornicating, nor receiving paramours; then if they are guilty of adultery when they are taken in marriage, they shall suffer half the punishment for free married women. This is for him among you who fears falling into evil. And that you abstain is better for you. And Allah is Forgiving. Merciful" (Qur’an 4:25).
“And marry those among you who are single, and those who are fit among your male slaves and your female slaves. If they are needy, Allah will make them free from want out of His grace. And Allah is Ample-giving, Knowing.” (Qur’an 24:32)
“And let those who can not find a match, keep chaste, until Allah makes them free from want out of His grace. And those of your slaves who ask for a writing (of freedom) give them the writing, if you know any good in them, and give them of the wealth of Allah which He has given you. And compel not your slave girls to prostition when they desire to keep chaste, in order to see the frail goods of this world’s life.(Qur’an 24:33)
Verse 4:25 clearly destroys the common charge hurled at Islam, that is sanctions concubinage. Nothing can be clearer than the words ‘not fornicating, nor receiving paramours.’ Verses 24:32-33 make it equally clear.