Numbers 31:23-27

Every thing that may abide the fire, ye shall make it go through the fire, and it shall be clean: nevertheless it shall be purified with the water of separation: and all that abideth not the fire ye shall make go through the water.

And ye shall wash your clothes on the seventh day, and ye shall be clean, and afterward ye shall come into the camp.

And the LORD spake unto Moses, saying,

Take the sum of the prey that was taken, both of man and of beast, thou, and Eleazar the priest, and the chief fathers of the congregation:

And divide the prey into two parts; between them that took the war upon them, who went out to battle, and between all the congregation: