the Holy Qur'an

If any of you have not the means wherewith to wed free believing women, they may wed believing girls from among those whom your right hands possess: And God hath full knowledge about your faith. Ye are one from another: Wed them with the leave of their owners, and give them their dowers, according to what is reasonable: They should be chaste, not lustful, nor taking paramours: when they are taken in wedlock, if they fall into shame, their punishment is half that for free women. This (permission) is for those among you who fear sin; but it is better for you that ye practise self-restraint. And God is Oft-forgiving, Most Merciful. (4:25)

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