Numbers 31 13:18

¹³Moses, Eleazar the priest and all the leaders of the community went to meet them outside the camp. ¹⁴Moses was angry with the officers of the army—the commanders of thousands and commanders of hundreds—who returned from the battle.

¹⁵“Have you allowed all the women to live?” he asked them. ¹⁶“They were the ones who followed Balaam’s advice and enticed the Israelites to be unfaithful to the LORD in the Peor incident, so that a plague struck the LORD’s people. ¹⁷Now kill all the boys. And kill every woman who has slept with a man, ¹⁸but save for yourselves every girl who has never slept with a man.