Numbers 31:22-24

Amplified Bible

²² only the gold, the silver, the bronze, the iron, the tin, and the lead, ²³ everything that can stand fire, you shall pass through fire, and it shall be clean. Nevertheless, it shall also be purified with the water of purification [to remove its impurity]; and all that cannot stand fire [such as fabrics] you shall pass through water. ²⁴ And you shall wash your clothes on the seventh day and be clean, and afterward you may come into the camp.”