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And Moses said unto them, Have ye saved all the women alive? ... 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. 31:15
Trivia: What were the names of the Israelite man and the Midianite woman that were killed by Phinehas in Numbers 25?