Tevilat Keilim: An Ethic of Independence

Why, after the battle of Midian are the Jews told about the laws of kashering vessels? They surely acquired vessels in previous wars as well! Why do glass and metal have to be immersed whereas other utensils don't require immersion?

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Delivered at the OU Israel Center, July 10th, 2018 (27 Tammuz 5778)