Numbers 31:7-17

7And they warred against the Midianites, as the LORD commanded Moses; and they slew all the males. 8And they slew the kings of Midian, besides the rest of them that were slain; namely, Evi, and Rekem, and Zur, and Hur, and Reba, five kings of Midian: Balaam also the son of Beor they slew with the sword. 9And the children of Israel took all the women of Midian captives, and their little ones, and took the spoil of all their cattle, and all their flocks, and all their goods. 10And they burnt all their cities in which they dwelt, and all their goodly castles, with fire. 11And they took all the spoil, and all the prey, both of men and of beasts. 12And they brought the captives, and the prey, and the spoil, to Moses, and Eleazar the priest, and to the congregation of the children of Israel, to the camp at the plains of Moab, which are by Jordan near Jericho.

13And Moses, and Eleazar the priest, and all the princes of the congregation, went forth to meet them outside the camp. 14And Moses was angry with the officers of the host, with the captains over thousands, and captains over hundreds, who came from the battle.1 15And Moses said to them, Have ye saved all the women alive? 16Behold, these caused the children of Israel, through the counsel of Balaam, to commit trespass against the LORD in the matter of Peor, and there was a plague among the congregation of the LORD. 17Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him.2