Numbers 31:21 MSG

[21] Eleazar the priest then spoke to the soldiers who had fought in the battle: “This is the ruling from the Revelation that God gave Moses: Gold, silver, bronze, iron, tin, and lead—and anything else that can survive fire—must be passed through the fire; then it will be ritually purified. It must also be ritually washed in the Water-of-Cleansing. Further, whatever cannot survive fire must be put through that water. On the seventh day scrub your clothes; you will be ritually clean. Then you can return to camp.”