וְהַעֲמִידֶ֥הָ עַל־גֶּחָלֶ֖יהָ רֵקָ֑ה לְמַ֨עַן תֵּחַ֜ם וְחָ֣רָה נְחֻשְׁתָּ֗הּ וְנִתְּכָ֤ה בְתוֹכָהּ֙ טֻמְאָתָ֔הּ תִּתֻּ֖ם חֶלְאָתָֽהּ׃
Rashi on Ezekiel
its filth shall be consumed [Heb. תִּתֻּם.] Its filth will end and be absorbed into its base. סִיר is [a pot] made of copper.