Related for Tahorot 7:6
הַגַּבָּאִים שֶׁנִּכְנְסוּ לְתוֹךְ הַבַּיִת, הַבַּיִת טָמֵא. אִם יֵשׁ עִמָּהֶן גּוֹי, נֶאֱמָנִים לוֹמַר לֹא נִכְנָסְנוּ, אֲבָל אֵין נֶאֱמָנִים לוֹמַר נִכְנַסְנוּ אֲבָל לֹא נָגָעְנוּ. הַגַּנָּבִים שֶׁנִּכְנְסוּ לְתוֹךְ הַבַּיִת, אֵין טָמֵא אֶלָּא מְקוֹם רַגְלֵי הַגַּנָּבִים. וּמַה הֵן מְטַמְּאִין. הָאֳכָלִים וְהַמַּשְׁקִים וּכְלֵי חֶרֶס הַפְּתוּחִין. אֲבָל הַמִּשְׁכָּבוֹת וְהַמּוֹשָׁבוֹת וּכְלֵי חֶרֶס הַמֻּקָּפִין צָמִיד פָּתִיל, טְהוֹרִים. אִם יֵשׁ עִמָּהֶן נָכְרִי אוֹ אִשָּׁה, הַכֹּל טָמֵא:
If tax collectors [assumed to be impure] entered a house, the house is impure. If there is a non-Jew with them, they are believed to say, "We did not enter," but they are not believed to say, "We entered but did not touch anything." Robbers who entered a house, only places where the robbers walked are impure. And what do they render impure? Foods and drinks and open earthenware vessels; but beds, couches and earthenware vessels closed with a tight seal are pure. If there was a non-Jew or a woman with them, everything is impure.