Translation:

24. Also (prohibited are) women already married except those whom your right hands possess. Thus hath Allah ordained (prohibitions) against you: except for these all others are lawful provided ye seek (them in marriage) with gifts from your property desiring chastity not lust. Seeing that ye derive benefit from them give them their dowers (at least) as prescribed; but if after a dower is prescribed ye agree mutually (to vary it) there is no blame on you and Allah is All-Knowing All-Wise.

Notes (Tafseer)

537. Whom your right hands possess: i.e., captives.

538. After defining the prohibited degrees, the verse proceeds to say that women other than those specified may be sought in marriage, but even so, not from motives of lust, but in order to promote chastity between the sexes. Marriage in the original Arabic is here described by a word which suggests a fortress (hisn): marriage is, therefore, the fortress of chastity.

539. As the woman in marriage surrenders her person, so the man also must surrender at least some of his property according to his means. And this gives rise to the law of Dower. A minimum dower is prescribed, but it is not necessary to stick to the minimum, and in the new relationship created, the parties are recommended to act towards each other with the greatest confidence and liberality.