Numbers 31:23-27

everything that can withstand the fire, you shall pass through the fire, and it will be clean, only it shall be purified with water for impurity. But whatever cannot withstand the fire you shall pass through the water.

And you shall wash your clothes on the seventh day and you will be clean; and afterward you may enter the camp.” Division of the Plunder

Then the Lord spoke to Moses, saying,

“You and Eleazar the priest and the heads of the fathers’ households of the congregation take a count of the spoils that were captured, both of people and of livestock;

and divide the spoils between the warriors who went to battle and all the congregation.