Numbers 31:22-23
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The Slaughter of Midian
22only the gold and the silver, the bronze, the iron, the tin, and the lead, 23everything that can withstand the fire, you shall pass through the fire, and it will be clean, only it shall be purified with water for impurity. But whatever cannot withstand the fire you shall pass through the water.
Numbers 31:22-23 (NASB)