Thematic Bible: Mode of purifying, taken in war

Then Eleazar the priest said to the men of the battle who came from the war, "This [is] the decree of the law that Yahweh commanded Moses. Only the gold and the silver, the bronze, the iron, the tin, and the lead-- everything that will go through the fire--you will pass through the fire, and it will be clean, and only in waters of impurity will it be purified. Whatever does not go into the fire you will pass through the waters.