Numbers 31:22-23
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22however the gold, and the silver, the brass, the iron, the tin, and the lead, 23everything that may abide the fire, you shall make to go through the fire, and it shall be clean; nevertheless it shall be purified with the water for impurity: and all that doesn`t withstand the fire you shall make to go through the water.
Numbers 31:22-23 (WEB)