Numbers 31:23 WEB

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

²²  however the gold, and the silver, the brass, the iron, the tin, and the lead,

²³  everything that may abide 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: and all that doesn't withstand the fire you shall make to go through the water.

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

²⁵  Yahweh spoke to Moses, saying,