Numbers 31:21-23

Complete Jewish Bible

²¹ El‘azar the cohen said to the soldiers who had gone to the front, “This is the regulation from the Torah which Adonai has ordered Moshe. ²² Even though gold, silver, brass, iron, tin and lead ²³ can all withstand fire, so that you are indeed to purify everything made of these materials by having them pass through fire; nevertheless they must also be purified with the water for purification. Everything that can’t withstand fire you are to have go through the water.