Zevachim11: 6
כְּלִי נְחֹשֶׁת שֶׁיָּצָא חוּץ לַקְּלָעִים, נִכְנָס, וּמוֹרְקוֹ וְשׁוֹטְפוֹ בְּמָקוֹם קָדוֹשׁ. נִטְמָא חוּץ לַקְּלָעִים, פּוֹחֲתוֹ, וְנִכְנָס, וּמוֹרְקוֹ וְשׁוֹטְפוֹ בְּמָקוֹם קָדוֹשׁ.
[If] the copper vessel was taken outside the curtains, he should re-enter [with it], and purge and rinse it in a holy place. [If] it was contaminated [with tumah] outside the curtains, he should breach it, re-enter, and purge and rinse it in a holy place.