Numbers 31:22-24

Revised Standard Version

²² only the gold, the silver, the bronze, the iron, the tin, and the lead, ²³ everything that can stand the fire, you shall pass through the fire, and it shall be clean. Nevertheless it shall also be purified with the water of impurity; and whatever cannot stand the fire, you shall pass through the water. ²⁴ You must wash your clothes on the seventh day, and you shall be clean; and afterward you shall come into the camp.”