Numbers 31:16

12 They brought the captives, spoils, and plunder to Moses, to Eleazar the priest, and to the congregation of Israel at the camp on the plains of Moab, by the Jordan across from Jericho.

13 And Moses, Eleazar the priest, and all the leaders of the congregation went to meet them outside the camp.

14 But Moses was angry with the officers of the army—the commanders of thousands and commanders of hundreds—who were returning from the battle.

15 “Have you spared all the women?” he asked them.

16 “Look, these women caused the sons of Israel, through the counsel of Balaam, to turn unfaithfully against the LORD at Peor, so that the plague struck the congregation of the LORD.

17 So now, kill all the boys, as well as every woman who has had relations with a man,

18 but spare for yourselves every girl who has never had relations with a man.

19 All of you who have killed a person or touched the dead are to remain outside the camp for seven days. On the third day and the seventh day you are to purify both yourselves and your captives.

20 And purify every garment and leather good, everything made of goat’s hair, and every article of wood.”

Read all of Numbers 31