Numbers 31:13-24 - The Army Returns
13 Moses and Eleazar the priest and all the leaders of the community went out to meet them outside the camp. 14 But Moses became livid with anger at the officers of the army, the captains of thousands, and the captains of hundreds who had returned from servicing in the battle. 15 "Did you keep all the women alive?" Moses asked them. 16 "Look! These women were the same ones who were counseled by Balaam to cause the Israelis to commit a grievous sin against the LORD at Peor. As a result, that plague infected the LORD's community. 17 You are to kill every male child and every woman who has had sexual relations with a man. 18 You are to allow the young women who haven't yet had sexual relations with a man to live for yourselves."
19 "Now you are to stay outside the camp for seven days, after which any of you who has killed a person or touched someone who was killed may purify yourselves on the third day. You and your captives will be pure on the seventh day. 20 Furthermore, you are to purify every garment that is, everything made of leather, goat's hair, or containing wood."
21 Eleazar the priest told the soldiers who had gone to battle, "This is the ordinance of the law that the LORD commanded Moses 22 concerning anything containing gold, silver, brass, iron, tin, lead, 23 or anything else that can survive a refiner's fire: You are to pass it through fire, after which it will be clean. Then it is to be purified with the water of impurity. Everything that cannot survive a refiner's fire is to be washed in water. 24 Wash your clothes on the seventh day, after which you will be clean. Then you may enter the camp."