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And they warred against the Midianites, as the LORD commanded Moses; and they slew all the males.
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Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him. But all the women children, that have not known a man by lying with him, keep alive for yourselves. Numbers 31:7, 16-17
And the children of Israel did evil in the sight of the LORD: and the LORD delivered them into the hand of Midian seven years. And the hand of Midian prevailed against Israel.
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For they came up with their cattle and their tents, and they came as grasshoppers for multitude; for both they and their camels were without number. Judges 6:1-2, 5