Captives is mentioned in the Quran in these verses:

[47:4] If you encounter (in war) those who disbelieve, you may strike the necks. If you take them as captives you may set them free or ransom them, until the war ends. Had God willed, He could have granted you victory, without war. But He thus tests you by one another. As for those who get killed in the cause of God, He will never put their sacrifice to waste.

[8:67] No prophet shall acquire captives, unless he participates in the fighting. You people are seeking the materials of this world, while God advocates the Hereafter. God is Almighty, Most Wise.

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