Numbers 31:22-24

22Any gold, silver, bronze, iron, tin, or lead—

23anything that won’t burn—must be put through fire in order to make it clean. Then it must also be put through the ritual water in order to take away its sin. Whatever might burn must ⌞only⌟ be put through the ritual water.

24On the seventh day wash your clothes, and you will be clean. Then you may come into the camp.”