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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. Numbers 31:15
Trivia: The people complained about the lack of food and water during the Exodus, so God sent fiery serpents to bite them.