Parashas Bamidbar
וּמִשְׁמַרְתָּ֗ם הָאָרֹ֤ן וְהַשֻּׁלְחָן֙ וְהַמְּנֹרָ֣ה וְהַֽמִּזְבְּחֹ֔ת וּכְלֵ֣י הַקֹּ֔דֶשׁ אֲשֶׁ֥ר יְשָׁרְת֖וּ בָּהֶ֑ם וְהַ֨מָּסָ֔ךְ וְכֹ֖ל עֲבֹדָתֽוֹ׃
Their duties comprised: the ark, the table, the lampstand, the altars, and the sacred utensils that were used with them, and the screendscreen I.e., the screening curtain; cf. 4.5.—all the service connected with these.
Torah Temimah points to TT / related (verified).
והמזבחת — תניא, כל הכלים שהיו במקדש טעונין טבילה לאחר הרגל.
English: “And the altars” — it was taught: All the vessels that were in the Temple require immersion after the festival.
Custom
Chazal teach that Temple vessels used by the public at the festivals require subsequent immersion.