Numbers 31:22

18But all the girls, who have not known man by lying with him, keep alive for yourselves.

19“Encamp outside of the camp for seven days. Whoever has killed any person, and whoever has touched any slain, purify yourselves on the third day and on the seventh day, you and your captives.

20You shall purify every garment, and all that is made of skin, and all work of goats’ hair, and all things made of wood.”

21Eleazar the priest said to the men of war who went to the battle, “This is the statute of the law which the LORD has commanded Moses.

22However the gold, and the silver, the bronze, the iron, the tin, and the lead,

23everything that may withstand the fire, you shall make to go through the fire, and it shall be clean; nevertheless it shall be purified with the water for impurity. All that doesn’t withstand the fire you shall make to go through the water.

24You shall wash your clothes on the seventh day, and you shall be clean. Afterward you shall come into the camp.”

25The LORD spoke to Moses, saying,

26“Count the plunder that was taken, both of man and of animal, you, and Eleazar the priest, and the heads of the fathers’ households of the congregation;