Numbers 31:13-18

¹³And Moses, Eleazar the priest, and all the leaders of the congregation went out to meet them outside the camp. ¹⁴But Moses was angry with the officers of the army, the commanders of thousands and the commanders of hundreds, who had come from service in the war. ¹⁵And Moses said to them, “Have you spared all the women? ¹⁶Behold, they caused the sons of Israel, through the counsel of Balaam, to be unfaithful to the Lord in the matter of Peor, so that the plague took place among the congregation of the Lord! ¹⁷Now therefore, kill every male among the little ones, and kill every woman who has known a man intimately. ¹⁸However, all the girls who have not known a man intimately, keep alive for yourselves.