Talmud for Kelim 9:6
הַגֶּפֶת וְהַזַּגִּין שֶׁנַּעֲשׂוּ בְטָהֳרָה וְהָלְכוּ עֲלֵיהֶם טְמֵאִים, וְאַחַר כָּךְ יָצְאוּ מֵהֶן מַשְׁקִין, טְהוֹרִין, שֶׁמִּתְּחִלָּתָן נַעֲשׂוּ בְטָהֳרָה. כּוּשׁ שֶׁבָּלַע אֶת הַצִּנּוֹרָא, מַלְמָד שֶׁבָּלַע אֶת הַדָּרְבָן, לְבֵנָה שֶׁבָּלְעָה אֶת הַטַּבַּעַת, וְהֵן טְהוֹרִים, נִכְנְסוּ לְאֹהֶל הַמֵּת, נִטְמָאוּ. הֱסִיטָן הַזָּב, נִטְמָאוּ. נָפְלוּ לַאֲוִיר הַתַּנּוּר טָהוֹר, טִמְּאוּהוּ. נָגַע בָּהֶן כִּכָּר שֶׁל תְּרוּמָה, טָהוֹר:
If olive or grape pomace was prepared in purity, and unclean persons trod upon them and afterwards liquids came out from them, they remain pure, since they had originally been prepared in conditions of purity. A spindle hook which was sunk into the spindle, or the iron point into the ox goad, or a ring into a brick, and all these were pure, and then they went into a tent in which there was a corpse, they become impure. If a <em>zav</em> [male suffering from abnormal genital discharge] shifted them they become impure. If they then fell into the air-space of a clean oven, they cause it to be impure. If a loaf of <em>terumah</em> bread [made from the priest's portion, which must remain ritually pure] came in contact with them, it remains pure.