Reference for Chullin 49:22

<big><strong>מתני׳</strong></big> טהור בכלי עץ טמא בכלי מתכות טהור בכלי מתכות טמא בכלי עץ:

It follows therefore, that that which cannot be rendered unclean in wooden articles can be rendered unclean in metal articles, and that which cannot be rendered unclean in metal articles can be rendered unclean in wooden articles.

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